There seems to be an excessive amount of bee's being spawned around a structure being generated. Something is bypassing the checks/limits,

Modpack: StaTech Industries v1.0.5hotfix
Mod Version used in pack: [Universal]Immersive Structures-2.0.7a.jar

Gets to a point where there were 1500+ bee's, /kill @e[minecraft:bee] gets rid of them, but not a viable solution to keep doing every so often.

I'll tweak it so only a small amount spawns initially with no replacement then.

This is still an issue as of 9/6/2023, they keep spawning with no mobcaps in place till a server chokes to death:

There's also no config so you can't even disable the structure either.

There's also no config so you can't even disable the structure either.

I've found same problem.
But I use a datapack to disable this structure - simply remove the entry of imst:beehouse in data\imst\worldgen\structure_set\common.json.