diff --git a/.changelog/479.txt b/.changelog/479.txt
new file mode 100644
index 000000000..9b2442596
--- /dev/null
+++ b/.changelog/479.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+internal/fwserver: Ensured nested block plan modifiers correctly set their request `AttributeConfig`, `AttributePlan`, and `AttributeState` values
+```
diff --git a/internal/fwserver/block_plan_modification.go b/internal/fwserver/block_plan_modification.go
index a8de19322..747f8f39b 100644
--- a/internal/fwserver/block_plan_modification.go
+++ b/internal/fwserver/block_plan_modification.go
@@ -160,13 +160,40 @@ func BlockModifyPlan(ctx context.Context, b fwschema.Block, req tfsdk.ModifyAttr
 			}
 
 			for name, block := range b.GetBlocks() {
+				attrConfig, diags := objectAttributeValue(ctx, configObject, name, fwschemadata.DataDescriptionConfiguration)
+
+				resp.Diagnostics.Append(diags...)
+
+				if resp.Diagnostics.HasError() {
+					return
+				}
+
+				attrPlan, diags := objectAttributeValue(ctx, planObject, name, fwschemadata.DataDescriptionPlan)
+
+				resp.Diagnostics.Append(diags...)
+
+				if resp.Diagnostics.HasError() {
+					return
+				}
+
+				attrState, diags := objectAttributeValue(ctx, stateObject, name, fwschemadata.DataDescriptionState)
+
+				resp.Diagnostics.Append(diags...)
+
+				if resp.Diagnostics.HasError() {
+					return
+				}
+
 				blockReq := tfsdk.ModifyAttributePlanRequest{
-					AttributePath: req.AttributePath.AtListIndex(idx).AtName(name),
-					Config:        req.Config,
-					Plan:          req.Plan,
-					ProviderMeta:  req.ProviderMeta,
-					State:         req.State,
-					Private:       resp.Private,
+					AttributeConfig: attrConfig,
+					AttributePath:   req.AttributePath.AtListIndex(idx).AtName(name),
+					AttributePlan:   attrPlan,
+					AttributeState:  attrState,
+					Config:          req.Config,
+					Plan:            req.Plan,
+					ProviderMeta:    req.ProviderMeta,
+					State:           req.State,
+					Private:         resp.Private,
 				}
 				blockResp := ModifyAttributePlanResponse{
 					AttributePlan:   blockReq.AttributePlan,
diff --git a/internal/fwserver/block_plan_modification_test.go b/internal/fwserver/block_plan_modification_test.go
index 861d21872..8bd32a22d 100644
--- a/internal/fwserver/block_plan_modification_test.go
+++ b/internal/fwserver/block_plan_modification_test.go
@@ -836,6 +836,257 @@ func TestBlockModifyPlan(t *testing.T) {
 				Private: testProviderData,
 			},
 		},
+		"block-list-nested-block-list": {
+			block: tfsdk.Block{
+				Attributes: map[string]tfsdk.Attribute{
+					"id": {
+						Type:     types.StringType,
+						Computed: true,
+						Optional: true,
+						PlanModifiers: []tfsdk.AttributePlanModifier{
+							resource.UseStateForUnknown(),
+						},
+					},
+				},
+				Blocks: map[string]tfsdk.Block{
+					"list": {
+						Attributes: map[string]tfsdk.Attribute{
+							"nested_computed": {
+								Type:     types.StringType,
+								Computed: true,
+								PlanModifiers: []tfsdk.AttributePlanModifier{
+									resource.UseStateForUnknown(),
+								},
+							},
+							"nested_required": {
+								Type:     types.StringType,
+								Required: true,
+							},
+						},
+						NestingMode: tfsdk.BlockNestingModeList,
+					},
+				},
+				NestingMode: tfsdk.BlockNestingModeList,
+			},
+			req: tfsdk.ModifyAttributePlanRequest{
+				AttributeConfig: types.List{
+					ElemType: types.ObjectType{
+						AttrTypes: map[string]attr.Type{
+							"id": types.StringType,
+							"list": types.ListType{
+								ElemType: types.ObjectType{
+									AttrTypes: map[string]attr.Type{
+										"nested_computed": types.StringType,
+										"nested_required": types.StringType,
+									},
+								},
+							},
+						},
+					},
+					Elems: []attr.Value{
+						types.Object{
+							AttrTypes: map[string]attr.Type{
+								"id": types.StringType,
+								"list": types.ListType{
+									ElemType: types.ObjectType{
+										AttrTypes: map[string]attr.Type{
+											"nested_computed": types.StringType,
+											"nested_required": types.StringType,
+										},
+									},
+								},
+							},
+							Attrs: map[string]attr.Value{
+								"id": types.String{Value: "configvalue"},
+								"list": types.List{
+									ElemType: types.ObjectType{
+										AttrTypes: map[string]attr.Type{
+											"nested_computed": types.StringType,
+											"nested_required": types.StringType,
+										},
+									},
+									Elems: []attr.Value{
+										types.Object{
+											AttrTypes: map[string]attr.Type{
+												"nested_computed": types.StringType,
+												"nested_required": types.StringType,
+											},
+											Attrs: map[string]attr.Value{
+												"nested_computed": types.String{Null: true},
+												"nested_required": types.String{Value: "configvalue"},
+											},
+										},
+									},
+								},
+							},
+						},
+					},
+				},
+				AttributePath: path.Root("test"),
+				AttributePlan: types.List{
+					ElemType: types.ObjectType{
+						AttrTypes: map[string]attr.Type{
+							"id": types.StringType,
+							"list": types.ListType{
+								ElemType: types.ObjectType{
+									AttrTypes: map[string]attr.Type{
+										"nested_computed": types.StringType,
+										"nested_required": types.StringType,
+									},
+								},
+							},
+						},
+					},
+					Elems: []attr.Value{
+						types.Object{
+							AttrTypes: map[string]attr.Type{
+								"id": types.StringType,
+								"list": types.ListType{
+									ElemType: types.ObjectType{
+										AttrTypes: map[string]attr.Type{
+											"nested_computed": types.StringType,
+											"nested_required": types.StringType,
+										},
+									},
+								},
+							},
+							Attrs: map[string]attr.Value{
+								"id": types.String{Value: "one"},
+								"list": types.List{
+									ElemType: types.ObjectType{
+										AttrTypes: map[string]attr.Type{
+											"nested_computed": types.StringType,
+											"nested_required": types.StringType,
+										},
+									},
+									Elems: []attr.Value{
+										types.Object{
+											AttrTypes: map[string]attr.Type{
+												"nested_computed": types.StringType,
+												"nested_required": types.StringType,
+											},
+											Attrs: map[string]attr.Value{
+												"nested_computed": types.String{Unknown: true},
+												"nested_required": types.String{Value: "configvalue"},
+											},
+										},
+									},
+								},
+							},
+						},
+					},
+				},
+				AttributeState: types.List{
+					ElemType: types.ObjectType{
+						AttrTypes: map[string]attr.Type{
+							"id": types.StringType,
+							"list": types.ListType{
+								ElemType: types.ObjectType{
+									AttrTypes: map[string]attr.Type{
+										"nested_computed": types.StringType,
+										"nested_required": types.StringType,
+									},
+								},
+							},
+						},
+					},
+					Elems: []attr.Value{
+						types.Object{
+							AttrTypes: map[string]attr.Type{
+								"id": types.StringType,
+								"list": types.ListType{
+									ElemType: types.ObjectType{
+										AttrTypes: map[string]attr.Type{
+											"nested_computed": types.StringType,
+											"nested_required": types.StringType,
+										},
+									},
+								},
+							},
+							Attrs: map[string]attr.Value{
+								"id": types.String{Value: "one"},
+								"list": types.List{
+									ElemType: types.ObjectType{
+										AttrTypes: map[string]attr.Type{
+											"nested_computed": types.StringType,
+											"nested_required": types.StringType,
+										},
+									},
+									Elems: []attr.Value{
+										types.Object{
+											AttrTypes: map[string]attr.Type{
+												"nested_computed": types.StringType,
+												"nested_required": types.StringType,
+											},
+											Attrs: map[string]attr.Value{
+												"nested_computed": types.String{Value: "statevalue"},
+												"nested_required": types.String{Value: "configvalue"},
+											},
+										},
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+			expectedResp: ModifyAttributePlanResponse{
+				AttributePlan: types.List{
+					ElemType: types.ObjectType{
+						AttrTypes: map[string]attr.Type{
+							"id": types.StringType,
+							"list": types.ListType{
+								ElemType: types.ObjectType{
+									AttrTypes: map[string]attr.Type{
+										"nested_computed": types.StringType,
+										"nested_required": types.StringType,
+									},
+								},
+							},
+						},
+					},
+					Elems: []attr.Value{
+						types.Object{
+							AttrTypes: map[string]attr.Type{
+								"id": types.StringType,
+								"list": types.ListType{
+									ElemType: types.ObjectType{
+										AttrTypes: map[string]attr.Type{
+											"nested_computed": types.StringType,
+											"nested_required": types.StringType,
+										},
+									},
+								},
+							},
+							Attrs: map[string]attr.Value{
+								"id": types.String{Value: "one"},
+								"list": types.List{
+									ElemType: types.ObjectType{
+										AttrTypes: map[string]attr.Type{
+											"nested_computed": types.StringType,
+											"nested_required": types.StringType,
+										},
+									},
+									Elems: []attr.Value{
+										types.Object{
+											AttrTypes: map[string]attr.Type{
+												"nested_computed": types.StringType,
+												"nested_required": types.StringType,
+											},
+											Attrs: map[string]attr.Value{
+												"nested_computed": types.String{Value: "statevalue"},
+												"nested_required": types.String{Value: "configvalue"},
+											},
+										},
+									},
+								},
+							},
+						},
+					},
+				},
+				Private: testEmptyProviderData,
+			},
+		},
 		"block-set-nested-usestateforunknown": {
 			block: tfsdk.Block{
 				Attributes: map[string]tfsdk.Attribute{