No update notifications for UnifiedNlp

I installed UnifiedNlp via the microg F-Droid repo. For some reason i'm never getting update notifications for UnifiedNlp updates. Notifications work fine for apps from the main F-Droid repo (including automatic download).

F-Droid version: 0.102
Android version: Cyanogenmod 14.1

Edit: F-Droid also tells me that 0.2.4-39 is signed with a different key than 0.2.4-30. Is this intended?

Start by investigating the UnifiedNlp package in the microg F-Droid repository using the reported F-Droid 0.102 and Android Cyanogenmod 14.1 versions. Check why updates are not notified and whether versions 0.2.4-39 and 0.2.4-30 use different signing keys; done means the cause and intended signing behavior are documented or corrected.

Written by the indexing model from the issue text.