As a result of converting things over to block models, some entity-rendered blocks that render invisible in vanilla will now render visibly when held by endermen. Said blocks include signs and hanging signs. However, decorated pots, despite also being converted over, do not render at all if held by endermen.

Without EBE:

With EBE:

Cause may be related to #168 if it's still pointing to the entity model somehow rather than proper block models.