SRB2 arbitrarily mistakes graphics for a sprite2 and crashes if a mod allocated a sprite2 as the first four letters of that graphic

Reproduce steps:

Load the Reveries asset file (reveries.pk3) and Modern Sonic (https://mb.srb2.org/addons/modern-sonic-v5-12.501/download) in any order

You'll immediately crash with a "R_AddSingleSpriteDef: No patches found for SLID frame 0 (A)" error.

And the log.txt says this:

Sprite SPR2_SLID allocated.
WARNING: Bad sprite name: SLIDOVER
WARNING: Bad sprite name: SLIDTIME

SLIDOVER and SLIDTIME are the lumps for the game over & time over text.