Thin cracks around rounded windows and doors/arches

I've found a selection of windows and doors/arches from the base game that have these fine cracks appearing around their rounded portions. My own theory is that it has something to do with the wall cutouts of these assets. This is visible on flat walls, not just diagonal ones. Graphics are on the highest settings.

The windows in question are:

• Arch You Happy to See Me?
• Window 2 Wide Version Angular
• Mega Window (Cloverleaf)

The doors and arches in question are:

• Door 2 Wide
• Prairie Post and Lintel Knockoff
• Arch with Keystone
• Mission-style Arch

The rounded windows and door from Cats & Dogs have these fine cracks appearing around their rounded portions. My own theory is that it has something to do with the wall cutouts of these assets. This is visible on flat walls, not just diagonal ones. Graphics are on the highest settings.

The windows in question are:

• The Port Hole Pane
• Lemon-Slice Lunette
• Lit Lookout

The door in question is:

• Paneled Portal

The Bonjour Soleil Arch window from Get to Work has these fine cracks appearing around its rounded portions. My own theory is that it has something to do with the wall cutout of this asset. This is visible on flat walls, not just diagonal ones. Graphics are on the highest settings.