When using plane cut in modeling mode I couldn’t get my rotation to snap to the angle I had selected, only to find out it was because the rotation was on local grid instead of world grid. This was confusing to me as it still should work or snap to something right? But it didn’t until I set it to world grid snap coords. Or maybe there’s some logical reasoning here that I’m not seeing.
Repro: place any kind of shape in modeling mode. Use the plane cut tool in both world and local coordinate system snapping mode. Result: grid snapping to the set angle will only work when on the world grid snap and not when on local mode.