Probuilder cube texturing problem

Hi.

I've created a Probuilder cube 1x1x1 and trying to apply the same material for 4 sides of it ( top and bottom will be other materials ). For two sides it's just drag-n-drop



but for other two sides I'm getting these weird results. I didn't mess with cube, everything's set to default. I have no idea why this is happening, it's the same material. What's going wrong?



Unity 2020.1.5f1, Probuilder 4.4.0