Extending block entity validity
Use Hooks::block_entity_type_add_blocks after retaining block and type keys from register. event.modify(kind, &[block]) extends one existing type; event.modify_matching(predicate, &[block]) extends all matching registered types. The event uses a RegistrationContext and runs before worlds load. Duplicate additions are harmless. Unknown keys and blocks that do not share the target's common vanilla superclass fail startup.
From the modding book of arismoko/horizonbfbda6a
A block may be valid for several entity types. Its native declaration or original vanilla template still selects creation and ticking. For example, a block declared with template: "minecraft:vault" and added to minecraft:vault creates and saves the vanilla vault entity. Adding another valid type does not replace that factory. Sign templates retain their existing membership defaults. Validity is frozen with the canonical type table and participates in the multiplayer content identity.
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