When you place an anvil above a chest from any height (excluding the air block directly above it) it breaks, dropping itself and playing the block.anvil.destroy (Anvil destroyed) sound. This seems to be only if it drops onto a chest, whether it be double or not. Videos attached.
MC-230938
Anvil breaks if dropped from any height on to a chest
Resolved
Works As Intended
0
The chest is not a full block, so falling blocks break when they fall onto it.