BTT doesn't block Touch ID. Maybe try to restart your system. Mostly when Touch ID is not working it's either because the system was "offline" for too long, or when some process is taking a lot of CPU.
I imagined that. I am thinking it might in this case as the whole Standard Buttons Part (Siri, Volume sider icons,BTT icon) are just invisible too. It only Shows the “left” side of the bar so my guess was that this is a btt thing.