Only able to paint pixels under certain conditions (Resolved)

My issue is that I seem to only be able to edit pixels under two conditions:

  1. There is already a painted pixel on the spot I want to paint
  2. I’m on the same layer as said pixel

This makes it impossible to do stuff on a fresh blank canvas. What’s weird is that the layer is shown as being edited (filled circle instead of no circle) despite no visual change.

Version: v1.2.40
Environment: MacOS 12.6

Edit 1: Also noticed it doesn’t allow you to replace pixels either. Maybe I accidentally switched some setting that locks the alpha?

Edit 2: I’m dumb, I had lock alpha on for my brush. Closing report.