Upgrade from 3.1.26 to 3.2.2 breaks functionality on android 4.3

Thanks so much for this wonderful app I'm running since month. But the todays update (on f-droid) from 3.1.26 to 3.2.2 stops the functionality on android 4.3: FC. Clearing cache (and cache+data) does not help: Had to uninstall the app and reinstall the older version.

On android N and O upgrading the app was no problem.

Any lib no more compatible with 4.3?