I have the same problem on several sites.
For me, the location rules say:
Show this field group if
Post Category is equal to Events
This works great when I’m making a new post and have to set the category as part of the workflow, however when I open an existing post to make an edit, the fields preview briefly and then hide. They re-appear after a second if I uncheck the category and re-check it.
It just seems like the feature that adjusts the visibility of the fields is not checking the post data on load. I hope this can be fixed!
