Duke3D: New swinging door behavior can be broken
Introduced with SVN r8722, commit ed5d2265.
Swinging doors now reverse direction automatically if there is something in the way. This can be broken, see the following video:
Enemies also tend to get stuck behind swinging doors now, and can break these doors as well:
The behavior from r8721 (commit 4c4fdd1f) seemed a bit more robust to me: