diff --git a/changelog_unreleased/css/pr-8567.md b/changelog_unreleased/css/pr-8567.md
index 3860e4169dbe..ca8637d99d32 100644
--- a/changelog_unreleased/css/pr-8567.md
+++ b/changelog_unreleased/css/pr-8567.md
@@ -1,22 +1,28 @@
-#### Fix: [Sass] Unexpectedly add extra space after function when passing arbitrary arguments ([#8567](https://github.com/prettier/prettier/pull/8567) by [@boyenn](https://github.com/boyenn))
+#### Improve Prettier handling of arbitrary arguments ([#8567](https://github.com/prettier/prettier/pull/8567), [#8566](https://github.com/prettier/prettier/pull/8566) by [@boyenn](https://github.com/boyenn))
+
+Prettier no longer unexpectedly add extra space after function when passing arbitrary arguments.
+Prettier no longer breaks code when inline number lists are used as arbitrary arguments.
 
 <!-- prettier-ignore -->
 ```css
 /* Input */
 body {
   test: function($list...);
-  test: function(return-list($list)...);
+  foo: bar(returns-list($list)...);
+  background-color: rgba(50 50 50 50...);
 }
 
 /* Prettier stable */
 body {
   test: function($list...);
-  test: function(return-list($list) ...);
+  foo: bar(returns-list($list) ...); 
+  background-color: rgba(50 50 50 50..);
 }
 
 /* Prettier master */
 body {
   test: function($list...);
-  test: function(return-list($list)...);
+  foo: bar(returns-list($list)...);
+  background-color: rgba(50 50 50 50...);
 }
 ```
diff --git a/src/language-css/parser-postcss.js b/src/language-css/parser-postcss.js
index 5fd2130b8bd8..7b25df944f53 100644
--- a/src/language-css/parser-postcss.js
+++ b/src/language-css/parser-postcss.js
@@ -14,7 +14,7 @@ const {
 } = require("./utils");
 const { calculateLoc, replaceQuotesInInlineComments } = require("./loc");
 
-function parseValueNodes(nodes) {
+function parseValueNodes(nodes, options) {
   let parenGroup = {
     open: null,
     close: null,
@@ -32,6 +32,19 @@ function parseValueNodes(nodes) {
   for (let i = 0; i < nodes.length; ++i) {
     const node = nodes[i];
 
+    if (
+      isSCSS(options.parser, node.value) &&
+      node.type === "number" &&
+      node.unit === ".." &&
+      node.value[node.value.length - 1] === "."
+    ) {
+      // Work around postcss bug parsing `50...` as `50.` with unit `..`
+      // Set the unit to `...` to "accidentally" have arbitrary arguments work in the same way that cases where the node already had a unit work.
+      // For example, 50px... is parsed as `50` with unit `px...` already by postcss-values-parser.
+      node.value = node.value.slice(0, -1);
+      node.unit = "...";
+    }
+
     if (node.type === "func" && node.value === "url") {
       const groups = (node.group && node.group.groups) || [];
 
@@ -153,13 +166,13 @@ function addMissingType(node) {
   return node;
 }
 
-function parseNestedValue(node) {
+function parseNestedValue(node, options) {
   if (node && typeof node === "object") {
     delete node.parent;
     for (const key in node) {
-      parseNestedValue(node[key]);
+      parseNestedValue(node[key], options);
       if (key === "nodes") {
-        node.group = flattenGroups(parseValueNodes(node[key]));
+        node.group = flattenGroups(parseValueNodes(node[key], options));
         delete node[key];
       }
     }
@@ -167,7 +180,7 @@ function parseNestedValue(node) {
   return node;
 }
 
-function parseValue(value) {
+function parseValue(value, options) {
   const valueParser = require("postcss-values-parser");
 
   let result = null;
@@ -183,7 +196,7 @@ function parseValue(value) {
 
   result.text = value;
 
-  const parsedResult = parseNestedValue(result);
+  const parsedResult = parseNestedValue(result, options);
 
   return addTypePrefix(parsedResult, "value-");
 }
@@ -321,7 +334,7 @@ function parseNestedCSS(node, options) {
 
       // Ignore LESS mixins
       if (node.mixin) {
-        node.selector = parseValue(selector);
+        node.selector = parseValue(selector, options);
 
         return node;
       }
@@ -366,7 +379,7 @@ function parseNestedCSS(node, options) {
         };
       }
 
-      node.value = parseValue(value);
+      node.value = parseValue(value, options);
     }
 
     if (
@@ -423,7 +436,7 @@ function parseNestedCSS(node, options) {
           node.variable = true;
           const parts = node.name.split(":");
           node.name = parts[0];
-          node.value = parseValue(parts.slice(1).join(":"));
+          node.value = parseValue(parts.slice(1).join(":"), options);
         }
 
         // Missing whitespace between variable and colon
@@ -433,7 +446,7 @@ function parseNestedCSS(node, options) {
           node.params[0] === ":"
         ) {
           node.variable = true;
-          node.value = parseValue(node.params.slice(1));
+          node.value = parseValue(node.params.slice(1), options);
         }
 
         // Less variable
@@ -466,7 +479,7 @@ function parseNestedCSS(node, options) {
 
       if (name === "at-root") {
         if (/^\(\s*(without|with)\s*:[\S\s]+\)$/.test(params)) {
-          node.params = parseValue(params);
+          node.params = parseValue(params, options);
         } else {
           node.selector = parseSelector(params);
           delete node.params;
@@ -478,7 +491,7 @@ function parseNestedCSS(node, options) {
       if (lowercasedName === "import") {
         node.import = true;
         delete node.filename;
-        node.params = parseValue(params);
+        node.params = parseValue(params, options);
         return node;
       }
 
@@ -505,7 +518,7 @@ function parseNestedCSS(node, options) {
         // Remove unnecessary spaces before SCSS control, mixin and function directives
         params = params.replace(/^(?!if)(\S+)\s+\(/, "$1(");
 
-        node.value = parseValue(params);
+        node.value = parseValue(params, options);
         delete node.params;
 
         return node;
diff --git a/tests/scss/scss/__snapshots__/jsfmt.spec.js.snap b/tests/scss/scss/__snapshots__/jsfmt.spec.js.snap
index e2388dddcfd3..d62d6378574f 100644
--- a/tests/scss/scss/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/scss/scss/__snapshots__/jsfmt.spec.js.snap
@@ -39,6 +39,16 @@ $parameters: (
 );
 $value: dummy($parameters...);
 
+body {
+  background-color: rgba(50, 50, 50, 50);
+  background-color: rgba(50 50 50 50...);
+  background-color: rgba(50 50 .50 50...);
+  background-color: rgba(50 50 50. .50...);
+  // Input is not technically valid ( output is ), but still nice to know that the \`.\` gets dropped as it would for \`50.\`
+  background-color: rgba(50 50 50 50....);
+  width: min(50px 20px 30px...);
+}
+
 =====================================output=====================================
 body {
   test: foo(return-list($list)...);
@@ -72,6 +82,16 @@ $parameters: (
 );
 $value: dummy($parameters...);
 
+body {
+  background-color: rgba(50, 50, 50, 50);
+  background-color: rgba(50 50 50 50...);
+  background-color: rgba(50 50 0.5 50...);
+  background-color: rgba(50 50 50 0.5...);
+  // Input is not technically valid ( output is ), but still nice to know that the \`.\` gets dropped as it would for \`50.\`
+  background-color: rgba(50 50 50 50...);
+  width: min(50px 20px 30px...);
+}
+
 ================================================================================
 `;
 
@@ -113,6 +133,16 @@ $parameters: (
 );
 $value: dummy($parameters...);
 
+body {
+  background-color: rgba(50, 50, 50, 50);
+  background-color: rgba(50 50 50 50...);
+  background-color: rgba(50 50 .50 50...);
+  background-color: rgba(50 50 50. .50...);
+  // Input is not technically valid ( output is ), but still nice to know that the \`.\` gets dropped as it would for \`50.\`
+  background-color: rgba(50 50 50 50....);
+  width: min(50px 20px 30px...);
+}
+
 =====================================output=====================================
 body {
   test: foo(return-list($list)...);
@@ -146,6 +176,16 @@ $parameters: (
 );
 $value: dummy($parameters...);
 
+body {
+  background-color: rgba(50, 50, 50, 50);
+  background-color: rgba(50 50 50 50...);
+  background-color: rgba(50 50 0.5 50...);
+  background-color: rgba(50 50 50 0.5...);
+  // Input is not technically valid ( output is ), but still nice to know that the \`.\` gets dropped as it would for \`50.\`
+  background-color: rgba(50 50 50 50...);
+  width: min(50px 20px 30px...);
+}
+
 ================================================================================
 `;
 
diff --git a/tests/scss/scss/arbitrary-arguments.scss b/tests/scss/scss/arbitrary-arguments.scss
index b290d5a6ce1d..531baa1af2c5 100644
--- a/tests/scss/scss/arbitrary-arguments.scss
+++ b/tests/scss/scss/arbitrary-arguments.scss
@@ -29,3 +29,13 @@ $parameters: (
   'b': 42
 );
 $value: dummy($parameters...);
+
+body {
+  background-color: rgba(50, 50, 50, 50);
+  background-color: rgba(50 50 50 50...);
+  background-color: rgba(50 50 .50 50...);
+  background-color: rgba(50 50 50. .50...);
+  // Input is not technically valid ( output is ), but still nice to know that the `.` gets dropped as it would for `50.`
+  background-color: rgba(50 50 50 50....);
+  width: min(50px 20px 30px...);
+}