Ironically, I've done this on several occasions as well. I am curious now that you mention hordenight spawns acting differently. Otherwise I'muna have to boobytrap my own base's internals for hordenights and I really don't want to do that haha.
I ran into this issue last night when playing with a couple friends - it was a base we built from scratch and my land-claim covered it, but even so we kept getting a couple random zombies spawning there ('twas a horde night, OFC).
I thought about it and presumed it was because the other two...
Beer/moonshine buff doesn't last for nearly long enough - it's like 30 seconds or something? I like the mechanic but it's just too complicated/expensive to produce for the duration it lasts. Certainly needs to go for longer (I presume fortbites/steroids are no different, but haven't tested...
Had a horde night the other day so figured I'd try this out - had the explosive weapons perk maxed out but could barely scratch the zombies with pipe bombs. I tried a few different options for timing the throw and where it'd land, but after 10-15 bombs and only enough kills to count on one hand...