Tub Cartridge Identification
It looks a lot like this Peerless RP70538, but your stem is a little longer/different.  Based on this, I'm pretty confident its a Peerless cartridge.  Maybe the longer stem detaches?
https://www.amazon.com/Single-Function-Pressure-Cartridge-Compatible-Peerless/dp/B08PQQ2XP1
I guess it could also be a foreign copy of a Peerless/Delta faucet as well.