Some Marketplace maps not loading on Realms

This should be an extension of issue REALMS-11913.
It was broken, then got fixed, and then the fix for RealismCraft broke it again.
It seems like RealismCraft works now, so do the more "popular" maps like Universal Studios, D&D.
But if I try a less popular map like, Mega warden by Cubed Creations, Better Clouds by Mine-North, it fails to join the Realm.
Also possibly related to REALMS-11919.