The various doom creature spawn eggs seem to not be fully registered in game (I don't know what that means, that's just the response I got from the dev of Apotheosis). In the apotheosis mod, there's an enchantment called capturing that gives mobs a chance to drop spawn eggs, but none of the doom mobs drop any. I commented on apotheosis's page and got the attached response from the dev.
. Is there an easy fix to this?

1.16.5 is abandoned