Fatal error after upgrading to Drupal 10

This fixes the error for me and I am able to use the site now.

Actually after further testing, this doesn't solve the issue.

I've updated the MR with a patch that works for me. I made the MenuLinkConfig plugin independent from menu_link_content, which should also fix the todo that was still there.

It's only tested briefly, so please thoroughly. I see e.g. in the menu editing for menu link config items that the machine name is not populated, not sure if that was there before.

Updating the title, this seems to be new since Drupal 10.2 specifically

@daften, The only change here is the interface change or did you both run into other changes needed?

This seems like the only change needed to fix this problem:

-  public function getEntity() {
+  public function getEntity(): MenuLinkConfigInterface {

Alternatively you could change to the decorator instead of extending and avoid these kind of bugs. Would that be an OK direction for this issue?

There is a patch for module update after upgrading.

I am just going to RTBC this as it's a fatal and up the priority

The patch in #11 seems to be just the MR in patch form

Fix the error regarding "Nullable types" as well in PHP 8.4.

@beloglazov91 could you add that to the MR?

MR lgtm.

Special thx to @joelpittet to notify the feature creel in ä10.
Technically, it's also addressing the related issue, but let's geit it in and call it a day.
Not adding #14 though.

Thank ya all!