With blossom, we are forced to deduplicate media by at least a user. So if you uploaded the same file as you had, and then deleted it, it would have deleted the only file. This only applies to blossom
Discussion
I just checked, and the timing works out, that's right around the time you guys added blossom support, and I used it for a week or two. I may have uploaded a duplicate and deleted it, unaware that it would delete the original too. Detective Fishcake.