My mob´s eggs does not exist!

I am with MCreator 2024.4 and GeckoLib.

I created my "animated entity" but I can´t find the egg in creative.

I summoned the entity, the animations, sounds, texture, AI were right, I also givle middle click to the mob and I got an spawn egg, but it is not in the creative panel.

Aparently no error reported.

Please help, and sorry for my bad english.