The mod InControl!, in some cases, overrides the blacklist for Brazier and spawns anyway. This is not consistent, however. Most mobs are blocked, however, in rare-ish cases, they aren't. There is no ability to change how InControl! works to allow Brazier to override it.

Also, LycanitesMobs seem to completely bypass the blacklist. I do have them some mobs spawning with InControl! but all LycanitesMobs that spawn do so even if they are blacklisted for Brazier.

For me, Brazier doesn't seem to block any spawns at all if I am using InControl, unfortunately. Hopefully this can be fixed, as I'd love to add this mod to my pack.

I would think so

is this still an issue?

I have just checked and custom spawners using InControl are still an issue

I have opened an issue here