Summoning a mossy skeleton will crash game

https://gist.github.com/itsdinkd/dd0e31e59a2754e6aa7721372af331fd

Those aren't intended to be used yet - they're not fully implemented.

The mod "Just Enough Ressources" will crash the game when it tries to render the mossy skeleton.
That isnt a big or an urgent issue I guess, but should I open an issue on their github ? Or would it be easier for you to fix it?

This is still an issue, when using JER

Do you know if there is any fix for this when unable to join a server after summoning this entity?

Those aren't intended to be used yet - they're not fully implemented.

Probably should be replaced with a safe "dummy" mob instead then that doesn't crash the game if called.