Canceling download only works for the first download

Device OS and version: Android 6.0.1
Device model/manufacturer: Samsung SM-G901F
F-Droid version (in the About screen): 0.102alpha3

What did you do? (clear steps if possible)

Started download of two applications and tried to cancel both of them via the Cancel Button, but only the first one was able to be canceled. The second click on the cancel button didnt work.

What did you expect to see?

Both of them are able to be canceled.

What did you see instead?

Only the first canceled did really terminate. The second was not able to be canceled.

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