Default [Q] Problem with HDR processing?

Hey, I've been having problems with some photos not being properly HDR processed. Like, I'd take a few pictures, and I think I'd lock the phone too quickly after that so the photo doesn't even end up getting processed. Any ideas how I might be able to get those pictures back, or prevent it from happening? I guess I could wait each time, but yeah, there are just these weird files lying around.

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