Forge: 1.19-forge-41.0.17
mod: guardvillagers-1.19-1.5.0.jar, bigbrain-1.6.0.jar, 1.19 version of Serilum mods

1. in-game mod version is marked as 1.4.2, not 1.5.0
   

2. Guard common sense option is on, but guard is not afraid of polar bear
   Also guard health regeneration amount configuration is not working either.
   
   

3. Illager common sense option is on, but illager is not afraid of polar bear
   
   

I can confirm that the version numbering and guards running away from polar bears are bugged but the illagers running away and guard regeneration amount seem to work for me. since you're using a config gui mod that updates the changes live could you try to load up your game again and see if those options work?

Marking as closed for now.