After leaving the game (but still running in background) and return, item frames disappear but I can still place items in them and rotate said item.
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duplicates 1
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A search shows this has already been reported at MCPE-12526
A search shows this has already been reported at MCPE-12526
Just use the search bar at the top, and then filter it to the project that you are looking for, such as pocket edition.
Here's an example:
https://bugs.mojang.com/browse/MCPE-12526?jql=project%20%3D%20MCPE%20AND%20text%20~%20%22invisible%20frame%22%20ORDER%20BY%20created%20ASC
Just use the search bar at the top, and then filter it to the project that you are looking for, such as pocket edition.
Here's an example:
https://bugs.mojang.com/browse/MCPE-12526?jql=project%20%3D%20MCPE%20AND%20text%20~%20%22invisible%20frame%22%20ORDER%20BY%20created%20ASC