Unable to recover from aborted download

• Device OS and version: Oppo Find X5 Lite ColorOS 12.1
• Device model/manufacturer: Oppo
• F-Droid version (in the About screen): 1.15.3
• F-Droid privileged extension version (if installed):

What did you do? (clear steps if possible)

Updated a big APK; while download was in progress I switched to another app; after a while I switched back

What did you expect to see?

The download should have been completed (ready to install)

What did you see instead?

The download progress bar did not advance when I switched back; however the app was offered for installation, but then could not be installed as the APK was invalid. When retrying to download, the progress bar jumped back and forth without making real progress ,and I was unable to abort the download. Even when leaving the update task and coming back later, the download cannot be aborted: