fix: not use prefixCls with custom theme #6063

components/config-provider/index.tsx

@@ -72,9 +72,10 @@ const setGlobalConfig = (params: GlobalConfigProviderProps & { theme?: Theme })
   }
   stopWatchEffect = watchEffect(() => {
     Object.assign(globalConfigBySet, reactive(params));
+    Object.assign(globalConfigForApi, reactive(params));
   });
   if (params.theme) {
-    registerTheme(params.prefixCls ?? getGlobalPrefixCls(), params.theme);
+    registerTheme(getGlobalPrefixCls(), params.theme);
   }
 };