diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8571393011..c05bac325d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,12 @@ should change the heading of the (upcoming) version to include a major version b
 
 -->
 
+# 6.0.0-beta.8
+
+## @rjsf/util
+
+- Fixed form data propagation with `patternProperties` [#4617](https://github.com/rjsf-team/react-jsonschema-form/pull/4617)
+
 # 6.0.0-beta.7
 
 ## @rjsf/core
diff --git a/packages/utils/src/findSchemaDefinition.ts b/packages/utils/src/findSchemaDefinition.ts
index 57178eee42..09abc7e215 100644
--- a/packages/utils/src/findSchemaDefinition.ts
+++ b/packages/utils/src/findSchemaDefinition.ts
@@ -6,6 +6,7 @@ import { GenericObjectType, RJSFSchema, StrictRJSFSchema } from './types';
 import isObject from 'lodash/isObject';
 import isEmpty from 'lodash/isEmpty';
 import UriResolver from 'fast-uri';
+import get from 'lodash/get';
 
 /** Looks for the `$id` pointed by `ref` in the schema definitions embedded in
  * a JSON Schema bundle
@@ -51,7 +52,7 @@ export function splitKeyElementFromObject(key: string, object: GenericObjectType
  * @param $ref - The ref string for which the schema definition is desired
  * @param [rootSchema={}] - The root schema in which to search for the definition
  * @param recurseList - List of $refs already resolved to prevent recursion
- * @param baseURI - The base URI to be used for resolving relative references
+ * @param [baseURI=rootSchema['$id']] - The base URI to be used for resolving relative references
  * @returns - The sub-schema within the `rootSchema` which matches the `$ref` if it exists
  * @throws - Error indicating that no schema for that reference could be resolved
  */
@@ -59,7 +60,7 @@ export function findSchemaDefinitionRecursive<S extends StrictRJSFSchema = RJSFS
   $ref?: string,
   rootSchema: S = {} as S,
   recurseList: string[] = [],
-  baseURI: string | undefined = ID_KEY in rootSchema ? rootSchema[ID_KEY] : undefined,
+  baseURI: string | undefined = get(rootSchema, [ID_KEY]),
 ): S {
   const ref = $ref || '';
   let current: S | undefined = undefined;
@@ -123,7 +124,7 @@ export function findSchemaDefinitionRecursive<S extends StrictRJSFSchema = RJSFS
 export default function findSchemaDefinition<S extends StrictRJSFSchema = RJSFSchema>(
   $ref?: string,
   rootSchema: S = {} as S,
-  baseURI: string | undefined = ID_KEY in rootSchema ? rootSchema[ID_KEY] : undefined,
+  baseURI: string | undefined = get(rootSchema, [ID_KEY]),
 ): S {
   const recurseList: string[] = [];
   return findSchemaDefinitionRecursive($ref, rootSchema, recurseList, baseURI);
diff --git a/packages/utils/src/schema/retrieveSchema.ts b/packages/utils/src/schema/retrieveSchema.ts
index 0b3a72d073..cb6d58d9d7 100644
--- a/packages/utils/src/schema/retrieveSchema.ts
+++ b/packages/utils/src/schema/retrieveSchema.ts
@@ -334,7 +334,7 @@ export function resolveReference<T = any, S extends StrictRJSFSchema = RJSFSchem
  * @param schema - The schema for which resolving all references is desired
  * @param rootSchema - The root schema that will be forwarded to all the APIs
  * @param recurseList - List of $refs already resolved to prevent recursion
- * @param baseURI - The base URI to be used for resolving relative references
+ * @param [baseURI] - The base URI to be used for resolving relative references
  * @returns - given schema will all references resolved or the original schema if no internal `$refs` were resolved
  */
 export function resolveAllReferences<S extends StrictRJSFSchema = RJSFSchema>(
@@ -432,7 +432,7 @@ export function stubExistingAdditionalProperties<
           validator,
           { allOf: Object.values(matchingProperties) } as S,
           rootSchema,
-          formData as T,
+          get(formData, [key]) as T,
           experimental_customMergeAllOf,
         );
         set(schema.properties, [key, ADDITIONAL_PROPERTY_FLAG], true);
@@ -578,7 +578,7 @@ export function retrieveSchemaInternal<
               validator,
               { allOf: [schema.properties[key], ...Object.values(matchingProperties)] } as S,
               rootSchema,
-              rawFormData as T,
+              get(rawFormData, [key]) as T,
               experimental_customMergeAllOf,
             );
           }
diff --git a/packages/utils/test/schema/retrieveSchemaTest.ts b/packages/utils/test/schema/retrieveSchemaTest.ts
index ed2d9f34b9..d128453fa3 100644
--- a/packages/utils/test/schema/retrieveSchemaTest.ts
+++ b/packages/utils/test/schema/retrieveSchemaTest.ts
@@ -1338,6 +1338,95 @@ export default function retrieveSchemaTest(testValidator: TestValidatorType) {
       });
     });
     describe('withPatternProperties()', () => {
+      it('validates schemas with conditions inside patternProperties', () => {
+        const schema: RJSFSchema = {
+          type: 'object',
+          properties: {
+            foo: {
+              type: 'object',
+            },
+          },
+          patternProperties: {
+            '^[a-z]+$': {
+              type: 'object',
+              properties: {
+                isString: { type: 'boolean' },
+              },
+              allOf: [
+                {
+                  if: {
+                    properties: { isString: { const: true } },
+                  },
+                  then: {
+                    properties: {
+                      value: {
+                        type: 'string',
+                      },
+                    },
+                  },
+                },
+                {
+                  if: {
+                    properties: { isString: { const: false } },
+                  },
+                  then: {
+                    properties: {
+                      value: {
+                        type: 'number',
+                      },
+                    },
+                  },
+                },
+              ],
+            },
+          },
+        };
+        const rootSchema: RJSFSchema = { definitions: {} };
+        testValidator.setReturnValues({
+          isValid: [true, false, true, false],
+        });
+        expect(
+          retrieveSchema(testValidator, schema, rootSchema, {
+            foo: { isString: true },
+            bar: { isString: true },
+          }),
+        ).toEqual({
+          ...schema,
+          properties: {
+            foo: {
+              type: 'object',
+              properties: { isString: { type: 'boolean' }, value: { type: 'string' } },
+            },
+            bar: {
+              [ADDITIONAL_PROPERTY_FLAG]: true,
+              type: 'object',
+              properties: { isString: { type: 'boolean' }, value: { type: 'string' } },
+            },
+          },
+        });
+        testValidator.setReturnValues({
+          isValid: [false, true, false, true],
+        });
+        expect(
+          retrieveSchema(testValidator, schema, rootSchema, {
+            foo: { isString: false },
+            bar: { isString: false },
+          }),
+        ).toEqual({
+          ...schema,
+          properties: {
+            foo: {
+              type: 'object',
+              properties: { isString: { type: 'boolean' }, value: { type: 'number' } },
+            },
+            bar: {
+              [ADDITIONAL_PROPERTY_FLAG]: true,
+              type: 'object',
+              properties: { isString: { type: 'boolean' }, value: { type: 'number' } },
+            },
+          },
+        });
+      });
       it('merges all subschemas that match the patternProperties regex', () => {
         const schema: RJSFSchema = {
           type: 'object',