Uploading a world with Beta APIs does not work properly, and will sometimes crash when uploading the world. Then, with uploading on the Windows edition, the pack no longer uploads with the world, even with the pack applied to the world outside the realm.
Tested on PS4, PS5, Android and Windows.
Did uploading packs with the world change on the latest updates?
Resource and Behavior Pack is: WorldEdit Bedrock Edition 0.9.7
Does your world have experimental features enabled?