Duke3D: (clipping) Shrinker projectile cannot enter spaces it previously fit into
This is another one of those edge-cases that are unusually common with Duke usermaps.
In a 3-episode mod called FM4X, there is a shrinker puzzle that reflects shrinker projectiles in a ring. The passages these projectiles have to enter are quite small, and starting from commit r7461 (48d1db93) the projectiles hit the wall instead of passing through.
Note that r7461 is a bugfix on commit r7409.
The location in question where projectiles are failing to pass through:
Map excerpt: shrinkersprite_collision.map