Drupal core follows one of two methods of handling the scenario where an entity's translation is being created/edited, and is has to
present an un-translatable field: Either hide the non-translatable fields during translation (create or edit), or show the field and append " (all languages)" to the field's label. As I understand it, the difference here is whether content is moderated or not.
I wish to hide an IEF field altogether when working in a host-entity form translation and its host entity reference field is configured to not be translatable.
Somewhat related to 🐛 Fix integration with content moderation in multi-lingual scenarios Needs work and others dealing with translations, but I don't think it's related to ✨ Show non-translatable fields instead of hiding them Needs work .
Postponed: needs info
1.0
Code
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I have the same problem in IEF 2.0.x and create a new patch for it.
I re-checked the logic of IEF 2.0.x, I think it's wrong to add validate in canBuild function, the judgement logic should be added to the section of $elements['#multilingual'] = TRUE;
so I create a new patch!