The "structure": "Fortress" restriction doesn't work properly

[DMBuce]

I'm trying to use InControl to spawn overworld hostile mobs such as creepers, zombies, etc. in the Nether using this config: https://github.com/DMBuce/mycopelago/tree/225cffa187aa47f0e3aa2d0b321750d25e173051/config/incontrol

When I added the rules for dimension -1, the normal nether mobs stopped spawning, so I had to add rules to make them spawn again. In order to get blazes and wither skeletons to spawn in nether fortresses, I added some "structure": "Fortress" rules, but they don't work properly. The blazes and wither skeletons only spawn in a single intersection of the nether fortress.

A few also spawn about 1 to 3 blocks outside of the intersection, but the rest of the fortress only spawns zombie pigmen and magma slimes, which don't have the "structure": "Fortress" restriction.

Here's a screenshot showing the issue: https://i.imgur.com/YDLsLsZ.png

Steps to reproduce:

• Start a new instance with Forge and InControl 3.8.2 using spawn.json and potentialspawn.json from https://github.com/DMBuce/mycopelago/tree/225cffa187aa47f0e3aa2d0b321750d25e173051/config/incontrol
• Start a new world with Creative mode, cheats enabled, and seed 6164729622751678786
• Build a portal and go to the nether
• Run command /tp 328 ~ 584 to be teleported to a nether fortress, near an intersection
• Watch as the fortress intersection you teleported to fills up with blazes and wither skeletons while the rest of the fortress only spawns zombie pigmen and magma slimes
• Once the mob cap fills up you can run /kill @e[type=!Player] to watch it happen all over again

[andrewminer]

I'm seeing exactly the same thing.