diff --git a/packages/core/src/Extension.ts b/packages/core/src/Extension.ts
index 7d847801..dbfe75be 100644
--- a/packages/core/src/Extension.ts
+++ b/packages/core/src/Extension.ts
@@ -243,12 +243,11 @@ export class Extension<Options = any> {
 
     extension.name = extendedConfig.name
       ? extendedConfig.name
-      : this.name
+      : extension.parent.name
 
-    extension.options = {
-      ...extension.parent.options,
-      ...extension.options,
-    }
+    extension.options = extendedConfig.defaultOptions
+      ? extendedConfig.defaultOptions
+      : extension.parent.options
 
     return extension
   }
diff --git a/packages/core/src/Mark.ts b/packages/core/src/Mark.ts
index 9be3a5a3..f4fa43fc 100644
--- a/packages/core/src/Mark.ts
+++ b/packages/core/src/Mark.ts
@@ -337,12 +337,11 @@ export class Mark<Options = any> {
 
     extension.name = extendedConfig.name
       ? extendedConfig.name
-      : this.name
+      : extension.parent.name
 
-    extension.options = {
-      ...extension.parent.options,
-      ...extension.options,
-    }
+    extension.options = extendedConfig.defaultOptions
+      ? extendedConfig.defaultOptions
+      : extension.parent.options
 
     return extension
   }
diff --git a/packages/core/src/Node.ts b/packages/core/src/Node.ts
index 960d4afb..6a84954e 100644
--- a/packages/core/src/Node.ts
+++ b/packages/core/src/Node.ts
@@ -410,12 +410,11 @@ export class Node<Options = any> {
 
     extension.name = extendedConfig.name
       ? extendedConfig.name
-      : this.name
+      : extension.parent.name
 
-    extension.options = {
-      ...extension.parent.options,
-      ...extension.options,
-    }
+    extension.options = extendedConfig.defaultOptions
+      ? extendedConfig.defaultOptions
+      : extension.parent.options
 
     return extension
   }