Look into SpawnEggs types being reset by de-/serialization

[WolfyScript]

Due to spigot material/item conversion SpawnEggs will reset to the type of the contained entity inside the NBT data. See https://hub.spigotmc.org/jira/browse/SPIGOT-5485

Possible fix: Re-apply the material after conversion. (Would probably require an extra field, that is saved to config)