24w21b Functions Fail on Java Realm

Datapack functions fail when loaded into Realm on latest snapshot 24w21b.

Reproduce:

1. Create world on 24w21b in singleplayer
2. Create datapack with functions using the new namespace "function"
3. Test functions (working as intended)
4. Upload world to Realms
5. Functions fail to load / be accessible with /function command

 

Wasn't sure the best place to post as there is no snapshot realm section that I can see