Issues with the "Form mode manager" module

It seems implementing hook_gin_content_form_routes() solves the problem.

Please register all the new routes with this hook.

As a quick workaround, the hook can be used in a custom module as:

function mymodule_gin_content_form_routes() {
  return [
    'entity.node.edit_form.myformmode',
  ];
}

Thank you, this works while editing entities, but there is still a problem when using /node/add-list/[CUSTOM_FORM_MODE] (which is problematic on its own and I'm trying to get rid of anyway, at least of the button links at /admin/content 😇

I came up with this:

  $route_match = Drupal::routeMatch();
  if ($route_match->getRouteObject()->hasOption('_form_mode_manager_entity_type_id') && !str_starts_with($route_match->getRouteName(), 'form_mode_manager.')) {
    return [$route_match->getRouteName()];
  }
  return [];
}

tim-diels → changed the visibility of the branch 3.x to hidden.

Added the code from the latest comment as a MR as this worked for me.