If an object with MF_SCENERY has ever been below a certain scale and is slid into a wall with a specific angle, the game freezes for... some reason.
The current scale of the mobj doesn't appear to matter, only what scale it once was, which is incredibly bizarre. This was discovered by SonicX8000 while he was helping me bugtest Elfilin within Techno Hill 2. If you utilize his doublejump ability at a very specific area, a conveyor will carry your spear through a midtexture wall, and when done at a specific spot, the game freezes.
He also created a test map to figure out exactly what's going on here, which can be downloaded here. I also included a small lua script that spawns a custom mobj at a scale that will in fact crash the game. Press C1 to spawn one with a destscale of 2*FRAC and an initial scale of FRAC/20., or C2 to spawn one that stays at the scale of FRAC/20.
Due to it being a freeze, no RPT is reported, so I can't really attach one.
Although both videos were recorded in next, the same issues still occur within 2.2.10. Would still be great if this could be fixed before .11's release though due to it causing problems with a mod that I do plan on releasing before whenever .12 comes out. I can just remove MF_SCENERY, so it's not a huge deal, but I do just try to optimize stuff in small ways whenever I can afford to.