I couldn't enter bughouse buildings in World's End and fixed all issues by installing Less Buggy Bughouse and placing it directly after your Building Collision Fix.mod in my load order.

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I'm just returning to Kenshi after long hiatus and this seems like a really nice collection to start my new playthrough with. Thanks for sharing! Sorry to be the bearer of bad news but:
I followed the instructions on a completely fresh install and a new save, but had issues with the bughouse. Examples can be found in World's End:
Dogs could pathfind inside the weapon shop but it seems it's out of bounds for bipeds. The armour shop is completely out of bounds. You can close the door and wait for the annoyed shopkeeper to get in range to interact with from outside, but I'm sure they'd prefer to do their business over their counter rather than screaming through the door like an uncouth barbarian. Another option is to push your character in bit by bit by another character, but obviously that isn't ideal and will leave the one inside stranded till they inevitably raise the alarm.
I tried devmode navmesh fix and manually moving buildings to no avail. On vanilla Kenshi I could get in, but I'm well aware that bug houses have always been somewhat ♥♥♥♥♥. This modlist on a fresh install never allowed me entry. I tried tracking down the culprit, but removing pathfinding mods did nothing and I couldn't find any edits to World's End in Reactive World. As such, I suspect the culprit may be City Architecture Total Overhaul, though I'm sure you don't want to hear that.
Less Buggy Bughouse
Load order: