Duke3D: Half-visible "Authorized Personnel" sign in E2L1
You know the one: https://imgur.com/SlQTMEk
I'm aware that this particular sprite is kind of a headache and has had rendering issues since the dawn of time.
Currently it renders correctly in Classic mode, but is cut off in Polymost and Polymer as in the screenshot. It used to be rendered correctly in Polymost for r5724, but broke again starting from r5725 (commit a125e137). As far as I can tell, after this commit the sign remained glitched like this in Polymost.
As for Polymer, I don't think there was ever a point where the renderer could display the sign properly.