Is there any way to stop a specific entity from dropping bags? I have apotheosis and would like to Zombies dropping bags as I will be allowing spawners for level farming

$EXCLUDEENTITIES: - This command determines if the entity list (if present) acts as a whitelist or as a blacklist, with true acting as a whitelist and false as a blacklist.
and
$STARTENTITYLIST - This command begins the entity list subgroup. It must have a list of entity entries followed by a $ENDENTITYLIST command. An entity entry is comprised of the command $VISIBLENAME: OR $INTERNALNAME:. For visible name entries, this is used in cases where a specific name is desired, for instance a player name, and will trigger on any entity who is visibly named that name. For internal name entries, every mob registered in the game has an internal name. This is usually the same as the entity's English localized name, though it is not guaranteed to be the case for modded mobs. This command can be skipped, it will be treated as an empty entity list.

are what you want. The internal name should be Zombie.