diff --git a/packages/survey-core/src/base.ts b/packages/survey-core/src/base.ts
index 20a018b6f5..cc54b1c5fa 100644
--- a/packages/survey-core/src/base.ts
+++ b/packages/survey-core/src/base.ts
@@ -509,8 +509,8 @@ export class Base {
   public getDefaultPropertyValue(name: string): any {
     const prop = this.getPropertyByName(name);
     if (!prop || prop.isCustom && this.isCreating) return undefined;
-    const dValue = prop.defaultValue;
-    if (!!prop.defaultValueFunc) return dValue;
+    if (!!prop.defaultValueFunc) return prop.defaultValueFunc(this);
+    const dValue = prop.getDefaultValue(this);
     if (!this.isPropertyEmpty(dValue) && !Array.isArray(dValue)) return dValue;
     const locStr = this.localizableStrings ? this.localizableStrings[name] : undefined;
     if (locStr && locStr.localizationName) return this.getLocalizationString(locStr.localizationName);
diff --git a/packages/survey-core/src/jsonobject.ts b/packages/survey-core/src/jsonobject.ts
index f3bec76c7a..f7244a1419 100644
--- a/packages/survey-core/src/jsonobject.ts
+++ b/packages/survey-core/src/jsonobject.ts
@@ -682,7 +682,7 @@ export class CustomPropertiesCollection {
       obj.createCustomLocalizableObj
     ) {
       const locStr = obj.createCustomLocalizableObj(prop.name);
-      locStr.defaultValue = prop.defaultValue;
+      locStr.defaultValue = prop.getDefaultValue(obj);
       var locDesc = {
         get: function () {
           return obj.getLocalizableString(prop.name);
@@ -699,7 +699,6 @@ export class CustomPropertiesCollection {
       };
       Object.defineProperty(obj, prop.name, desc);
     } else {
-      var defaultValue = prop.defaultValue;
       var isArrayProp = prop.isArray || prop.type === "multiplevalues";
       if (typeof obj.createNewArray === "function") {
         if (Serializer.isDescendantOf(prop.className, "itemvalue")) {
@@ -715,10 +714,10 @@ export class CustomPropertiesCollection {
           }
         }
         if (isArrayProp) {
+          const defaultValue = prop.getDefaultValue(obj);
           if (Array.isArray(defaultValue)) {
             obj.setPropertyValue(prop.name, defaultValue);
           }
-          defaultValue = null;
         }
       }
       if (!!obj.getPropertyValue && !!obj.setPropertyValue) {
@@ -727,7 +726,7 @@ export class CustomPropertiesCollection {
             if (!!prop.onGetValue) {
               return prop.onGetValue(obj);
             }
-            return obj.getPropertyValue(prop.name, defaultValue);
+            return obj.getPropertyValue(prop.name, undefined);
           },
           set: function (v: any) {
             if (!!prop.onSetValue) {
diff --git a/packages/survey-core/src/mask/mask_base.ts b/packages/survey-core/src/mask/mask_base.ts
index fa53b920ff..16ee4f5816 100644
--- a/packages/survey-core/src/mask/mask_base.ts
+++ b/packages/survey-core/src/mask/mask_base.ts
@@ -33,7 +33,7 @@ export class InputMaskBase extends Base implements IInputMask {
     const properties = Serializer.getProperties(this.getType());
     properties.forEach(property => {
       const currentValue = json[property.name];
-      (this as any)[property.name] = currentValue !== undefined ? currentValue : property.defaultValue;
+      (this as any)[property.name] = currentValue !== undefined ? currentValue : property.getDefaultValue(this);
     });
   }
   public getData(): any {
diff --git a/packages/survey-core/tests/jsonobjecttests.ts b/packages/survey-core/tests/jsonobjecttests.ts
index db98ab63ed..e17591a759 100644
--- a/packages/survey-core/tests/jsonobjecttests.ts
+++ b/packages/survey-core/tests/jsonobjecttests.ts
@@ -3442,4 +3442,22 @@ QUnit.test("Add availableInMatrixColumn attribute", function (assert) {
   Serializer.removeProperty("question", "prop1");
   Serializer.removeProperty("question", "prop2");
   Serializer.removeProperty("question", "prop3");
-});
\ No newline at end of file
+});
+QUnit.test("Add defaultFunc attribute based on another property & obj parameter, Bug#9108", function (assert) {
+  Serializer.addProperty("question", { name: "secondName", defaultFunc: (obj: any) => { return obj.name + "_second"; } });
+  const obj: any = new QuestionTextModel("q1");
+  assert.equal(obj.secondName, "q1_second", "secondName #1");
+  obj.name = "q2";
+  assert.equal(obj.secondName, "q2_second", "secondName #2");
+  assert.deepEqual(obj.toJSON(), { name: "q2" }, "toJSON #1");
+
+  obj.secondName = "q3_s";
+  assert.equal(obj.secondName, "q3_s", "secondName #3");
+  assert.deepEqual(obj.toJSON(), { name: "q2", secondName: "q3_s" }, "toJSON #2");
+
+  obj.resetPropertyValue("secondName");
+  assert.equal(obj.secondName, "q2_second", "secondName #4");
+  assert.deepEqual(obj.toJSON(), { name: "q2" }, "toJSON #3");
+
+  Serializer.removeProperty("question", "secondName");
+});