Try fixing router v3

public/404.html

@@ -6,7 +6,7 @@
       // This text is simply to make sure the 404.html file is bigger than 512 bytes, else, internet explorer will ignore it.
       // Thank you internet explorer for requiring such awesome workarounds in order to work properly
       // ====================================================================================================================
-      sessionStorage.redirect = location.href;
+      sessionStorage.redirect = location.pathname;
     </script>
     <meta http-equiv="refresh" content="0;URL='/'">
   </head>

src/main.js

@@ -34,7 +34,7 @@ new Vue({
     if (sessionStorage.redirect) {
       const { redirect } = sessionStorage;
       delete sessionStorage.redirect;
-      this.$router.push(redirect);
+      router.push(redirect);
     }
   },
 }).$mount('#app');