Thats pretty much it. I moved repeater field from one group to another and then dicsovered that subfields were not transfered.
Edit: After more testing i get following picture. Seems like it depends on order of your actions.
If (after repeater field got moved) i save the field group it was moved from then repeater in target group will appear empty. However if i first go to target group (without saving source group) and save it then all subfiled of repeater will be in their place. However if i try to add data i will see that repeater subfileds got rendered twice. Going back to source group and re-saving it solves the problem.
Hope this will help to nail the bug.
Having this same exact issue, although it’s good to see that the order in which you do things helps to alleviate it. Working w/ Support now to try to get it resolved.
Happens with Flexible Content Fields as well.