Just as in the subject line, the text screens meant to appear when transitioning to the secret levels in both TNT Evilution and Plutonia are not working. All other text screens are functioning correctly. When I looked through the WADs, I found some unusual tags pointed towards the KEX engine. The secret level exits in particular are tagged kex_intertextsecretlocid while all other text screen tags use kex_intertextlocid instead. It seems this id is specifically used to overwrite the default Doom II text screens, and while the second one I mentioned is working correctly, the first is erroring in some way.