Every time undo changes state of some item, item background gets lost.
It seems it's not enough to simply undo - you have to undo the change on the item with the background.
Replication steps:- Create a few empty MIDI items
- Open notes for those items
- Load image and set as item background
- Copy those items around arrange
- Undo
- Puf! Images gone
Using 64bit Win10, REAPER 5.95
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