I added a Soul Lantern to a Swarm Spider Spawner to have it ignore light level, which resulted in an instant crash, as well as a crash every time the server starts.

The relevant line in the log appears to be class shadows.apotheosis.spawn.spawner.LyingLevel cannot be cast to class net.minecraft.server.level.ServerLevel

Presumably this happens with more Spawners as well. I have not tested others.

Fixed in 0.4.30.