fix(vue3): prevent mixin leakage caused by inspection, fix #2037 (#2038)

Co-authored-by: Himself65 <himself65@outlook.com>

packages/app-backend-vue3/src/components/data.ts

@@ -485,7 +485,7 @@ function mergeOptions (
       if (!to[key]) {
         to[key] = from[key]
       } else {
-        Object.assign(to[key], from[key])
+        to[key] = Object.assign(Object.create(null), to[key], from[key])
       }
     }
   }