Unlike colored shulker boxes, the undyed versions can be put inside bundles, allowing for
what's essentially infinite inventory storage.

This is caused by an oversight in the bundle's "minecraft:storage_item" component. It bans "minecraft:shulker_box" from being put inside, but that doesn't cover the regular version, which has the "minecraft:undyed_shulker_box" ID.

Additionally, it'd be better to list every single variant manually instead of relying on outdated unified IDs.