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When editing a post that is part of a relationship, you may find the UI for related posts disabled (the buttons to Add or Connect posts are greyed-out).
This occurs if the connected posts have been trashed (e.g. while editing a child post and the parent is in the trash).
We have identified this usability issue and are working on a fix.
In the meantime if you observe the same, locate the connected posts in the trash and restore or delete them.