Baby Zoglin is become an adult when the game loads.
The cause seems to be that the IsBaby data values are not stored in the NBT.
Also unable to summon the baby variant with /summon command.
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is duplicated by 3
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A reminder: baby undead don't age. Baby zombies would've been the earliest example, and their lack of aging was marked "works as intended". So the real bug with baby Zoglins is that they age up at all. They should not be able to grow up under any circumstances.
EDIT: although maybe that was your point. Just noticed you said the tag for their "age status", not "age timer".
Or "IsBaby"tag, because zoglins are undead mobs.