How to Reproduce

run the following command:

give @s minecraft:iron_hoe[block_transformer=[{block_state_provider:{type:rule_based_state_provider,rules:[{if_true:{type:matching_blocks,blocks:["minecraft:moss_block"]},then:{type:simple_state_provider,state:{Name:"minecraft:gold_block"}}}]}}]]

Expected

The game should either execute the /give command (and give me an iron hoe that could turn only moss_block into gold_block) or return failed.

Actually

The crash happens:

io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:set_entity_data'

Then the game shows the Connection Lost window with message Disconnected, and once you try to reopen the same world, it says Disconnected.