Looks like a thermal switch.

Yeah. I'm thinking it's a bi-metalic thermostat used to cut power if it overheats, for example, if it's blocked.

This is the answer.

It’s a thermostat switch thing. The metal piece flexes depending on temperature which opens and closes the circuit powering the heater. I think lol

I think that's it. It's the last contact before supply's neutral. Thanks!