Certain form validation errors make the sidebar move to the bottom of the page and the form operations disappear

Confirmed, this is happening, and it removes the save button... so you can't fix the error, and then save.

True, it causes data loss since editors can’t save their changes.

I think this should be fixed with the latest changes from https://www.drupal.org/project/gin/issues/3457385 🐛 Form buttons missing in modal/off-canvas Needs review

That fixes the issue for me, thanks!

Closing this as duplicate and moving the issue credit over 👀