commit 54ac18bcf83e2fe21b4b5d6c2f09562c8ce6c135
Author: Dino Bollinger <dino.bollinger@gmail.com>
Date:   Thu Aug 5 13:03:30 2021 +0200

    Duke3D: Remove leading period from startdir to fix a bug
    
    With the leading period, the resulting path after Bcorrectfilename() is
    applied does not have a leading slash, causing the string comparison with
    the defined level filename to fail even if a usermap is part of an episode.

commit 6e394dd1f265f34b22d2d15cded9c390ed6f1a34
Author: Dino Bollinger <dino.bollinger@gmail.com>
Date:   Thu Aug 5 01:05:16 2021 +0200

    Engine: Plan B for commit b4f633d1, remove the conditional entirely
    
    The previous attempt broke the window at the start of E1L3 of Duke3D.
    Whatever this was intended for doesn't work with animated maskwalls.

See https://voidpoint.io/terminx/eduke32 for more details.