Bottom tab buttons are invisible

Device OS and version: Android 11
Device model/manufacturer: Samsung Galaxy A70 or Android Emulator
F-Droid version (in the About screen): from Git (master)
F-Droid privileged extension version (if installed):

What did you do? (clear steps if possible)

Launched the app

What did you expect to see?

Expected to see the usual buttons in the bottom tab bar (Catalog, Updates, etc)

What did you see instead?

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