diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a2daf81cc51..1dafef2b75a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -37,7 +37,7 @@ jobs:
       fail-fast: false
       max-parallel: 2
       matrix:
-        platform: [ubuntu-latest, ubuntu-22.04, windows-latest, macos-latest, macos-11, windows-2022]
+        platform: [ubuntu-latest]
     steps:
       - name: Checkout into dir1
         uses: actions/checkout@v3
@@ -94,7 +94,7 @@ jobs:
       fail-fast: false
       max-parallel: 2
       matrix:
-        platform: [ubuntu-latest, ubuntu-22.04, windows-latest, macos-11, macos-latest, windows-2022]
+        platform: [ubuntu-latest]
 
     steps:
       - name: Checkout to branch
@@ -149,7 +149,7 @@ jobs:
       fail-fast: false
       max-parallel: 4
       matrix:
-        platform: [ubuntu-latest, ubuntu-22.04, windows-latest, macos-latest, macos-11, windows-2022]
+        platform: [ubuntu-latest]
 
     steps:
       - name: Checkout to branch
@@ -184,7 +184,7 @@ jobs:
       fail-fast: false
       max-parallel: 4
       matrix:
-        platform: [ubuntu-latest, ubuntu-22.04, windows-latest, macos-latest, macos-11, windows-2022]
+        platform: [ubuntu-latest]
 
     steps:
       - name: Checkout to branch
@@ -212,7 +212,7 @@ jobs:
       fail-fast: false
       max-parallel: 4
       matrix:
-        platform: [ubuntu-latest, ubuntu-22.04, windows-latest, macos-latest, macos-11, windows-2022]
+        platform: [ubuntu-latest]
         fetch-depth: [1, 2]
 
     steps:
@@ -238,7 +238,7 @@ jobs:
       fail-fast: false
       max-parallel: 4
       matrix:
-        platform: [ubuntu-latest, ubuntu-22.04, windows-latest, macos-latest, macos-11, windows-2022]
+        platform: [ubuntu-latest]
 
     steps:
       - name: Checkout to branch
@@ -290,7 +290,7 @@ jobs:
       fail-fast: false
       max-parallel: 4
       matrix:
-        platform: [ubuntu-latest, ubuntu-22.04, windows-latest, macos-latest, macos-11, windows-2022]
+        platform: [ubuntu-latest]
 
     steps:
       - name: Checkout to branch
@@ -945,21 +945,21 @@ jobs:
       - name: Get branch name
         id: branch-name
         uses: tj-actions/branch-names@v6
-        if: github.event_name == 'pull_request'
+        if: github.event_name == 'pull_request' && matrix.fetch-depth == 0
       - uses: nrwl/nx-set-shas@v3
         id: last_successful_commit
-        if: github.event_name == 'pull_request' && github.event.action != 'closed'
+        if: github.event_name == 'pull_request' && github.event.action != 'closed' && matrix.fetch-depth == 0
         with:
           main-branch-name: ${{ steps.branch-name.outputs.base_ref_branch }}
           workflow-id: 'test.yml'
       - name: Run changed-files with a custom base sha
-        if: github.event_name == 'pull_request' && github.event.action != 'closed'
+        if: github.event_name == 'pull_request' && github.event.action != 'closed' && matrix.fetch-depth == 0
         id: changed-files-custom-base-sha
         uses: ./
         with:
           base_sha: ${{ steps.last_successful_commit.outputs.base }}
       - name: Show output
-        if: github.event_name == 'pull_request' && github.event.action != 'closed'
+        if: github.event_name == 'pull_request' && github.event.action != 'closed' && matrix.fetch-depth == 0
         run: |
           echo '${{ toJSON(steps.changed-files-custom-base-sha.outputs) }}'
         shell:
diff --git a/README.md b/README.md
index b8c2d038001..cef095ada65 100644
--- a/README.md
+++ b/README.md
@@ -63,6 +63,7 @@ on:
     branches:
       - main
 
+
 jobs:
   build:
     runs-on: ubuntu-latest  # windows-latest | macos-latest
diff --git a/action.yml b/action.yml
index 998c2b39d47..659544e7637 100644
--- a/action.yml
+++ b/action.yml
@@ -81,13 +81,9 @@ inputs:
     required: false
     default: "false"
   fetch_depth:
-    description: "Initial depth of the branch history fetched. **NOTE**: This can be adjusted to resolve errors with insufficient history."
+    description: "Depth of additional branch history fetched. **NOTE**: This can be adjusted to resolve errors with insufficient history."
     required: false
     default: "50"
-  max_fetch_depth:
-    description: "Maximum depth of the branch history fetched. **NOTE**: This can be adjusted to resolve errors with insufficient history."
-    required: false
-    default: "9000"
   since_last_remote_commit:
     description: "Use the last commit on the remote branch as the `base_sha`. Defaults to the last non merge commit on the target branch for pull request events and the previous remote commit of the current branch for push events."
     required: true
@@ -173,6 +169,7 @@ runs:
         GITHUB_BASE_REF: ${{ github.base_ref }}
         GITHUB_HEAD_REF: ${{ github.head_ref }}
         GITHUB_WORKSPACE: ${{ github.workspace }}
+        GITHUB_EVENT_NUMBER: ${{ github.event.number }}
         GITHUB_EVENT_HEAD_REPO_FORK: ${{ github.event.pull_request.head.repo.fork }}
         GITHUB_EVENT_PULL_REQUEST_BASE_SHA: ${{ github.event.pull_request.base.sha }}
         GITHUB_EVENT_PULL_REQUEST_HEAD_SHA: ${{ github.event.pull_request.head.sha }}
@@ -188,7 +185,6 @@ runs:
         INPUT_UNTIL: ${{ inputs.until }}
         INPUT_PATH: ${{ inputs.path }}
         INPUT_FETCH_DEPTH: ${{ inputs.fetch_depth }}
-        INPUT_MAX_FETCH_DEPTH: ${{ inputs.max_fetch_depth }}
         INPUT_SINCE_LAST_REMOTE_COMMIT: ${{ inputs.since_last_remote_commit }}
     - name: Glob match
       uses: tj-actions/glob@v16
@@ -204,6 +200,7 @@ runs:
         working-directory: ${{ inputs.path }}
         base-sha: ${{ steps.changed-files-diff-sha.outputs.previous_sha }}
         sha: ${{ steps.changed-files-diff-sha.outputs.current_sha }}
+        diff: ${{ steps.changed-files-diff-sha.outputs.diff }}
         include-deleted-files: true
         separator: "|"
     - run: |
@@ -223,6 +220,7 @@ runs:
         INPUT_CURRENT_SHA: ${{ steps.changed-files-diff-sha.outputs.current_sha }}
         INPUT_TARGET_BRANCH: ${{ steps.changed-files-diff-sha.outputs.target_branch }}
         INPUT_CURRENT_BRANCH: ${{ steps.changed-files-diff-sha.outputs.current_branch }}
+        INPUT_DIFF: ${{ steps.changed-files-diff-sha.outputs.diff }}
         INPUT_QUOTEPATH: ${{ inputs.quotepath }}
         INPUT_INCLUDE_ALL_OLD_NEW_RENAMED_FILES: ${{ inputs.include_all_old_new_renamed_files }}
         INPUT_OLD_NEW_SEPARATOR: ${{ inputs.old_new_separator }}
diff --git a/diff-sha.sh b/diff-sha.sh
index fc529d6835d..5e064a68ef1 100644
--- a/diff-sha.sh
+++ b/diff-sha.sh
@@ -13,7 +13,7 @@ if [[ "$GITHUB_REF" == "refs/tags/"* ]]; then
   EXTRA_ARGS="--prune --no-recurse-submodules"
 fi
 
-if [[ "$GITHUB_EVENT_HEAD_REPO_FORK" == "true" ]]; then
+if [[ -z $GITHUB_BASE_REF || "$GITHUB_EVENT_HEAD_REPO_FORK" == "true" ]]; then
   DIFF=".."
 fi
 
@@ -158,36 +158,6 @@ else
 
   echo "Fetching remote refs..."
 
-  if [[ "$INPUT_SINCE_LAST_REMOTE_COMMIT" == "false" ]]; then
-    # shellcheck disable=SC2086
-    git fetch -u --progress $EXTRA_ARGS --depth="$INPUT_FETCH_DEPTH" origin +refs/heads/"$TARGET_BRANCH":refs/remotes/origin/"$TARGET_BRANCH" 1>/dev/null 2>&1
-    git branch --track "$TARGET_BRANCH" origin/"$TARGET_BRANCH" 1>/dev/null 2>&1 || true
-    # shellcheck disable=SC2086
-    git fetch $EXTRA_ARGS -u --progress --depth=$(( GITHUB_EVENT_PULL_REQUEST_COMMITS + 1 )) origin +"$GITHUB_REF":refs/remotes/origin/"$CURRENT_BRANCH" 1>/dev/null 2>&1
-
-    COMMON_ANCESTOR=$(git merge-base --fork-point "$TARGET_BRANCH" HEAD) && exit_status=$? || exit_status=$?
-
-    if [[ -z "$COMMON_ANCESTOR" ]]; then
-      echo "::debug::Unable to locate a common ancestor for the current branch: $CURRENT_BRANCH"
-    else
-      echo "::debug::Common ancestor: $COMMON_ANCESTOR"
-
-      DATE=$(git show --quiet --date=iso8601 --format=%cd "$COMMON_ANCESTOR")
-
-      if [[ -z "$DATE" ]]; then
-        echo "::error::Unable to locate a date for the common ancestor: $COMMON_ANCESTOR"
-        exit 1
-      else
-        # shellcheck disable=SC2086
-        git fetch $EXTRA_ARGS --shallow-since="${DATE}" origin +refs/heads/"$TARGET_BRANCH":refs/remotes/origin/"$TARGET_BRANCH" 1>/dev/null 2>&1
-        echo "::debug::Date: $DATE"
-      fi
-    fi
-  else
-    # shellcheck disable=SC2086
-    git fetch $EXTRA_ARGS -u --progress --depth="$INPUT_FETCH_DEPTH" origin +"$GITHUB_REF":refs/remotes/origin/"$CURRENT_BRANCH" 1>/dev/null 2>&1
-  fi
-
   echo "::debug::Getting HEAD SHA..."
   if [[ -n "$INPUT_UNTIL" ]]; then
     echo "::debug::Getting HEAD SHA for '$INPUT_UNTIL'..."
@@ -198,6 +168,9 @@ else
       exit 1
     fi
   else
+    # shellcheck disable=SC2086
+    git fetch $EXTRA_ARGS -u --progress --deepen="$INPUT_FETCH_DEPTH" origin "$CURRENT_BRANCH" 1>/dev/null 2>&1
+
     if [[ -z $INPUT_SHA ]]; then
       CURRENT_SHA=$(git rev-list -n 1 HEAD) && exit_status=$? || exit_status=$?
     else
@@ -222,21 +195,26 @@ else
 
   if [[ -z $INPUT_BASE_SHA ]]; then
     if [[ "$INPUT_SINCE_LAST_REMOTE_COMMIT" == "true" ]]; then
+      echo "::debug::Fetching remote current branch..."
+
+      # shellcheck disable=SC2086
+      git fetch $EXTRA_ARGS -u --progress --deepen="$INPUT_FETCH_DEPTH" origin "$CURRENT_BRANCH" 1>/dev/null 2>&1
+
       PREVIOUS_SHA=$GITHUB_EVENT_BEFORE
       
       if ! git rev-parse --quiet --verify "$PREVIOUS_SHA^{commit}" 1>/dev/null 2>&1; then
         PREVIOUS_SHA=$(git rev-parse origin/"$CURRENT_BRANCH")
       fi
     else
-      PREVIOUS_SHA=${COMMON_ANCESTOR:-}
-      
-      if [[ -z "$PREVIOUS_SHA" ]]; then
-        PREVIOUS_SHA=$GITHUB_EVENT_PULL_REQUEST_BASE_SHA && exit_status=$? || exit_status=$?
-      fi
+      echo "::debug::Fetching remote target branch..."
+      # shellcheck disable=SC2086
+      git fetch $EXTRA_ARGS -u --progress --deepen="$INPUT_FETCH_DEPTH" origin "$TARGET_BRANCH" 1>/dev/null 2>&1
 
-      if ! git diff --name-only --ignore-submodules=all "$PREVIOUS_SHA$DIFF$CURRENT_SHA" 1>/dev/null 2>&1; then
-        PREVIOUS_SHA=$GITHUB_EVENT_PULL_REQUEST_BASE_SHA
-      fi
+      echo "::debug::Fetching remote current branch..."
+      # shellcheck disable=SC2086
+      git fetch $EXTRA_ARGS -u --progress origin pull/"$GITHUB_EVENT_NUMBER"/head:"$CURRENT_BRANCH" 1>/dev/null 2>&1
+
+      PREVIOUS_SHA=$(git merge-base origin/"$TARGET_BRANCH" "$CURRENT_SHA") && exit_status=$? || exit_status=$?
     fi
 
     if [[ -z "$PREVIOUS_SHA" || "$PREVIOUS_SHA" == "$CURRENT_SHA" ]]; then
@@ -247,37 +225,14 @@ else
   else
     PREVIOUS_SHA=$INPUT_BASE_SHA && exit_status=$? || exit_status=$?
   fi
-  
-  if [[ "$INPUT_SINCE_LAST_REMOTE_COMMIT" == "false" ]]; then
-    if [[ -f .git/shallow ]]; then
-      depth=$INPUT_FETCH_DEPTH
-      max_depth=$INPUT_MAX_FETCH_DEPTH
-
-      for ((i=20; i<max_depth; i+=depth)); do
-        if git diff --name-only --ignore-submodules=all "$PREVIOUS_SHA$DIFF$CURRENT_SHA" 1>/dev/null 2>&1; then
-          break
-        fi
-        
-        if [[ -z "$INPUT_BASE_SHA" ]]; then
-          NEW_PREVIOUS_SHA=$(git merge-base --fork-point "$TARGET_BRANCH" "$CURRENT_SHA") && exit_status=$? || exit_status=$?
-          
-          if [[ -n "$NEW_PREVIOUS_SHA" ]]; then
-            PREVIOUS_SHA=$NEW_PREVIOUS_SHA
-          fi
-        fi
-
-        echo "Fetching $i commits..."
 
-        # shellcheck disable=SC2086
-        git fetch $EXTRA_ARGS -u --progress --deepen="$i" origin $TARGET_BRANCH $CURRENT_SHA 1>/dev/null 2>&1
-      done
+  if ! git diff --name-only --ignore-submodules=all "$PREVIOUS_SHA$DIFF$CURRENT_SHA" 1>/dev/null 2>&1; then
+    PREVIOUS_SHA=$(git rev-parse origin/"$TARGET_BRANCH") && exit_status=$? || exit_status=$?
+    DIFF=".."
 
-      if ((i > max_depth)); then
-        echo "::error::Unable to locate a common ancestor between $TARGET_BRANCH and $CURRENT_BRANCH with: $PREVIOUS_SHA$DIFF$CURRENT_SHA"
-        exit 1
-      fi
-    else
-      echo "::debug::Not a shallow clone, skipping merge-base check."
+    if ! git diff --name-only --ignore-submodules=all "$PREVIOUS_SHA$DIFF$CURRENT_SHA" 1>/dev/null 2>&1; then
+      echo "::error::Unable find a diff between $PREVIOUS_SHA and $CURRENT_SHA"
+      exit 1
     fi
   fi
 
@@ -305,12 +260,14 @@ if [[ -z "$GITHUB_OUTPUT" ]]; then
   echo "::set-output name=current_branch::$CURRENT_BRANCH"
   echo "::set-output name=previous_sha::$PREVIOUS_SHA"
   echo "::set-output name=current_sha::$CURRENT_SHA"
+  echo "::set-output name=diff::$DIFF"
 else
   cat <<EOF >> "$GITHUB_OUTPUT"
 target_branch=$TARGET_BRANCH
 current_branch=$CURRENT_BRANCH
 previous_sha=$PREVIOUS_SHA
 current_sha=$CURRENT_SHA
+diff=$DIFF
 EOF
 fi
 
diff --git a/get-changed-paths.sh b/get-changed-paths.sh
index efe967e7142..bff1402becc 100755
--- a/get-changed-paths.sh
+++ b/get-changed-paths.sh
@@ -8,11 +8,7 @@ INPUT_SEPARATOR="${INPUT_SEPARATOR//$'\n'/'%0A'}"
 INPUT_SEPARATOR="${INPUT_SEPARATOR//$'\r'/'%0D'}"
 
 GITHUB_OUTPUT=${GITHUB_OUTPUT:-""}
-DIFF="..."
-
-if [[ -z $GITHUB_BASE_REF || "$GITHUB_EVENT_HEAD_REPO_FORK" == "true" ]]; then
-  DIFF=".."
-fi
+DIFF=$INPUT_DIFF
 
 if [[ $INPUT_QUOTEPATH == "false" ]]; then
   git config --global core.quotepath off
@@ -78,14 +74,14 @@ function get_diff() {
   done < <(git submodule | awk '{print $2}')
 
   if [[ "$INPUT_DIR_NAMES" == "true" ]]; then
-    git diff --diff-filter="$filter" --name-only --ignore-submodules=all "$base$DIFF$sha" | xargs -I {} dirname {} | get_dirname_max_depth | uniq && exit_status=$? || exit_status=$?
+    git diff --diff-filter="$filter" --name-only --ignore-submodules=all --no-merges "$base$DIFF$sha" | xargs -I {} dirname {} | get_dirname_max_depth | uniq && exit_status=$? || exit_status=$?
 
     if [[ $exit_status -ne 0 ]]; then
       echo "::error::Failed to get changed directories between: $base$DIFF$sha"
       exit 1
     fi
   else
-    git diff --diff-filter="$filter" --name-only --ignore-submodules=all "$base$DIFF$sha" && exit_status=$? || exit_status=$?
+    git diff --diff-filter="$filter" --name-only --ignore-submodules=all --no-merges "$base$DIFF$sha" && exit_status=$? || exit_status=$?
 
     if [[ $exit_status -ne 0 ]]; then
       echo "::error::Failed to get changed files between: $base$DIFF$sha"