Contextual link does not link to right form display

Can you add more detail about your configuration and the use case ?
I don't understand the use case ...

I guess I have the same issue, I'll try to make it a bit clearer:

When editing an entity containing media references e.g. for image media, there's a pencil symbol to edit the media and choose e.g. a focal point. The media edit form will be opened in a modal. However, this modal will contain the default edit form for the media element, not a contextual form as expected. The modal title will be e.g. 'Edit image xyz', not 'Override media item in context of...'. This means, the focal point settings will be global for all references to this media element, not contextual (bound to the parent entity) as expected.

There's a missing piece somewhere. The form display settings for the reference field in the parent entity allow to choose between 'Media library' and 'Media library extra', the latter is chosen. Are we missing something? Does e.g. the reference field need to use a special field type?

Guess I answered the question myself:

There's indeed a separate field type for media references, 'Media with contextual modifications'. Does this mean the module can't be used on a site with existing media references? Or is there some way to convert them?

It seems a drush command exist : drush media_library_media_modify:migrate

see : https://www.drupal.org/project/media_library_media_modify/issues/3309696 💬 Any way to use on existing fields? Active