Working on another issue I came across this bug.
The view is of a splayed door, no leaf, no casing, no threshold, and frames-etc set to minimum. Works like a charm, ...except ...
The problem is that the openings are cutting holes in the curved wall diametrically opposite the opening.
The unwanted holes are also following an angled trajectory per the wall, so they appear lower than their counterparts.
Rebuilding view, altering wall settings, etc doesn't help.
My guess: The door wallhole is probably infinite in depth, not noticeable until you place a wall that curves back upon itself,
allowing the infinite depth "feature" to show up.
Snap