I saw this problem now.
I accepted a swap with one photo in a coin on 5 February, and we rated the swap on 9 and 12 February. I do not know when my photo was deleted from my coin swapped, but now (1 Abril) I am updating my list and “my coin” (it is now their coin) has not my photo (I have the coin in my swap list, but without my photo; the photo is in my picture storage, marked as deleted).
I think the system should not delay deletion, the system should never delete photos of my swap items when I swap them: I could swap other item instead of that, or want copy the photo before remove the items from my swap list.
The photos must be deleted (or choose between two options: delete or mark as deleted) when I remove the items from my swap list, but not before.
Wanted & swap list (euro coins & world coins, exonumia and banknotes circulated)
https://goo.gl/AQjfKp - I have euro & world CC coins for swap.