EggZavier not dropping some eggs?

[Ebereasider]

The announcement post clearly said Eggzavier should drop EVERY egg up to mythic:

EggZavier is allegedly the undead beastmaster, whose loot table contains every egg in the game, up to and including Mythic rarity

But seems like it's not dropping some newer legendary and mythic pets, namely:
-Prower
-Rudolph
-Venim
-Chester
-Oconi
-Wylenor

Can a dev clarify this plz?