Entity Reference translation

I tried to use custom entities via ECK instead of Paragraphs but the issue is the same, so the problem extends to all kind of entity reference (?)

The solution is to enable the "Show language selector on create and edit pages" checkbox and the block settings, then selecting the proper language on each translation, this seems to work although randomly the created paragraphs are blocked from editing, you have to resave the layout to unblock them.
This seems to be still a bug as there should be no need for an extra language selection, as for any other block with normal fields, the translation should be inferred from the layout context (?).

When I met the same problem when using paragraphs, I settled the issue temporarily by https://www.drupal.org/project/paragraphs/issues/3090200 🐛 Paragraph access check using incorrect revision of its parent, leading to issues editing and viewing paragraphs when content moderation is involved. Needs work