Hi!
I noticed that in San Myshuno vampires stay on lots until the morning, up to 12 hours, sometimes longer.
When vampires hypnotize a victim, the game slows down for a few seconds, and in their action queue (I looked at it with the Do Something mod, the Stop Doing command) there are up to 10, sometimes more Drink Deeply interactions on different sims on the lot (probably why vampires stay on the lots for almost half a day).
If the target is a spellcaster, it gives BE and LE (usually happens once every few days): Mod Kayaker_V_ReasonToSlay_MainMod_v1.1 - Vampire Name vampire_DrinkFail_TargetIsSpellcaster:1899 on Spellcater Name.
Game version 1.117.227.1030. Kayaker_V_ReasonToSlay_MainMod_v1.1.package, Kayaker_V_ReasonToSlay_OptionalOverrides_v1.1.package are installed. There are no conflicts between A Reason to Slay (Vampires) and other mods. I checked it in the area where the Casbah Gallery is located in San Myshuno.
Interestingly, in other worlds, there were no such problems and everything worked fine, but in San Myshuno, the mod causes an invasion of vampires.