Fix vanilla template with html

Author: CompuIves

packages/app/src/sandbox/compile.ts

@@ -550,15 +550,18 @@ async function compile({
               : '<div id="root"></div>'
         );
 
-        document.body.innerHTML = body;
-
         if (lastHeadHTML && lastHeadHTML !== head) {
           document.location.reload();
         }
         if (manager && lastBodyHTML && lastBodyHTML !== body) {
           manager.clearCompiledCache();
         }
 
+        if (!firstLoad || process.env.LOCAL_SERVER) {
+          // The HTML is loaded from the server as a static file, no need to set the innerHTML of the body
+          // on the first run.
+          document.body.innerHTML = body;
+        }
         lastBodyHTML = body;
         lastHeadHTML = head;
       }