Duke3D: Jittery camera movement when on top of stretching sector (SE 20)
This is an issue that dates all the way back to DOS.
Open the test map (from E2L5) activate the keycard panel to make the sector stretch, then jump onto it and strafe in the direction it is extending. You will notice rather jittery camera movement while it is active.
Video demonstration: https://cdn.discordapp.com/attachments/461290354726010891/870661445648547880/2021-07-30_15-36-29.mp4
Test map: jittersector.map