finally vivaldi is fixed, had to delete the desktop item in .local/share/application and let it be repopuated

modules/nixos/apps/vivaldi/default.nix

@@ -19,6 +19,9 @@ in
     environment.systemPackages = with pkgs; [
       vivaldi
       vivaldi-ffmpeg-codecs
+      qt5.qtwayland
     ];
+
+    # environment.sessionVariables.NIXOS_OZONE_WL = "1";
   };
 }