I just noticed that HRE have some strange bug when you use hotkey to select Monastery and buildings with Monastery role (Regnitz Cathedral). For some reason this hotkey also cycles between Outposts, Keeps and Wall Outposts which are not monastery and they have their unique hotkeys to select. same with hotkey which select all religious buildings (it select religious+Keeps+Outposts).
Thank you @user11! The team is working on this one, but it’s at least a few updates out. Your report is very much appreciated!