MobjDamage hook doesn't seem to trigger in non-NiGHTS Special Stages for MT_PLAYER

Testing with a really basic script that prints damaged when the MobjDamage hook fires on MT_PLAYER. As you can clearly see here, the hook works fine in singleplayer.

Also works in NiGHTS, whether it's a Special Stage or not. (It actually fires multiple times, as seen by the repetitive damaged in the console.)

But not in the multiplayer Specials? (used objectplace to spawn the spikes here)