Hi, thank god some humor. Needed that. Before a deadline everybody is dead serious...
My testing is done with CR renders.
Tx to explain where the displacement setting is, but I don't know how to show it in the C4D physical or standard renderer. The default PBR I made with displacement renders in CR with displacement visable but not visable in C4D standard and physical renderer. In CR it shows fine exept for the mismatch under cubic projection.
Well, good to see at your end the problem seems not there.
But here it remains, I tested in v8 & C4DR25 and the mismatch is there too. what could it be ? I set up my testfile in the simplest way possible. Maybe you send me your file with your file including the magic behind the second wall.