Blue screen w/ antialiasing and post-processing on macOS

On macOS, the game window is blue when antialiasing = 2 and post-processing enable.

Here's a minimal settings.cfg:

[Post Processing]
enabled = true
[Video]
antialiasing = 2   # 1 works fine

I've reproduced this on an M3 MacBook Pro on ca3a286cc4 (0.49), using Steam data and no mods.

openmw-blue-screen.log.xz

This was also mentioned in #7052.