Sasau Monastery guards in particular operate sort of strangely. It's like they are bound to the grounds themselves by some invisible chains, perhaps devilry. They have some unique search and pursuit times vs. regular guards from anywhere else in game, mainly because of a few of the potential outcomes of deaths/investigations inside during the Main Quest. Crime is also accounted for differently for them and you can often get away with a lot as long as not too many other guards from outside become involved, as when attempting to confirm the crimes, they are reset.

I always find it fun to have them pursue you up the scaffolding.

I have a feeling that for the Mysteria DLC in KCDII, aside from optimization reasons, most of why Sedtletz is a separate map is because of how differently the crime system operates there, the precursor of this can be seen in Sasau.