Not sure if this is a glitch fo’ sure but I can’t change the outcome. (I’ve tried pretty much everything). As you can see in the image, I get weird glitchy refractions in my glazing. The glazing is shown as 10mm thick, though the same result occurs when it’s two layers of 4mm with an air gap. The only way I have been able to lose this glitch is by making it a single face (no thickness), which isn’t ideal, and I imagine not how the refraction works. This happens with the basic glass material that comes out of the box with D5. I’m using the free version.
I’ve updated graphics drivers too. If it helps, I’ve got an RTX 2070.