Great mod, the infection is a brilliant idea. Unfortunately, it appears that if you're in an underground world, i.e. with bedrock at world limit, the horde spawns on top of the bedrock instead of near the player. Could it be changed so they spawn within a certain y level of the player?

The Zombie Player can be hurt by other mods, and probably environmental effects like lava. Could you add a config option so they can only be harmed by a player?

Added a config option for the 1.18 and 1.19 versions in 1.1.6 to disable the zombie taking damage from non-player sources, the settings will be backported to 1.16 and 1.12 soon.

As for the other change, that would requre quite a few rewrites at the moment but I'll possibly look into changing them, once the datapack support is finished.