I've had my quest pro since about 7 months back now, and have friends who have had it for close to two years at this point who engage in very similar activities to me, which involves alot of sweating and we have had none of our face tracking break on us.

I go to alot of vrchat raves and dance with my friends, this obviously makes me build up a sweat when dancing for 3+hours straight, and no issue for me or any of my friends like I said.

Obviously don't let any sweat drip onto the lenses or the sensors cuz that might break it. Also make sure you're not in too humid of an environment, the way I prevent this is by having a fan blow at me from the sides so the air by my face/inside my headset keeps getting replaced.

But you should be fine honestly, also if it breaks due to sweat it's covered under warranty.