Thank you! I've spent hours on this and --keepParent solved the problem for me!

Did you find the cause of this issue? I am seeing it randomly on textures I am generating internally (for bitmap fonts) on an MacBook Pro with an M1 Pro. I assume it's an issue with the blitting of the intermediate buffer to the texture; what's strange is the randomness though... the blitting code is pretty mature and this doesn't happen with images loaded via libpng.