Bafang BBS02B Rattle

I recently started to experience this rattle with my Bafang BBS02B.

The motor has around 500 miles since being installed a little over a month ago. Everything was fine up to this point but now it seems to mainly happen between 10 and 20 mph under throttle and PAS. Doesn’t happen under natural pedaling (no motor). I’ve checked the drivetrain and everything seems tight. Motor still seems to perform fine but wasn’t making this noise before.

Any ideas? This doesn’t seem normal but this is my first Bafang motor and I’m looking for any insight or possible solutions.