Moving app to background while compresssing a video corrupts the process with "Processed: -22B"

**Describe the bug**
Title says it.

**Settings applied**
Did not try to reproduce with clean install.

**App Logs**
Compression seems to go on forever after Processed turns to -22B, and I cancelled, and no logs are produced.

**File used**
Try with a file of your own, and ask me for one if you failed to reproduce. It's hard for me to upload. The file should be big (e.g. 100MB)