Looking at Splats Funny Crashes next

I was trying to investigate splats not interpolating as part of the new uncapped merge by using this never-released partial recreation of Lethal Lava Land that I made, and lo-and-behold, the game crashes upon trying to look at them.

The map in question is this, and it works completely fine in 2.2.10.

It's specifically next that it crashes in, which makes sense because it seems to crash inside of interpolation code. This can be seen in the crash log here:

Error occurred on Thursday, November 10, 2022 at 15:56:16.

srb2win.exe caused an Access Violation at location 005A19E2 in module srb2win.exe Reading from location 00000010.

Registers:
eax=0000b52d ebx=00000000 ecx=00000000 edx=12ead410 esi=056bf7a8 edi=00000000
eip=005a19e2 esp=056bf600 ebp=056bf658 iopl=0         nv up ei pl nz na po nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00210206

AddrPC   Params
005A19E2 00000000 0000B52D 056BF7A8  srb2win.exe!R_InterpolateMobjState
005B92D5 12EB0320 000000FF 000000FF  srb2win.exe!R_AddSprites
0058F7D5 00000000 00000000 00000000  srb2win.exe!R_RenderBSPNode