Despite the minecraft:boat and minecraft:chest_boat entity types being removed, their translation keys are still present and not listed in deprecated.json. For consistency with the existing translation key deprecation policy, I would expect these translation keys to be listed in deprecated.json.
MC-276949
Old boat entity type translation keys are not deprecated
Resolved
Fixed
0
— their translation keys are still present
The cited assertion is false. This objection notwithstanding, I am able to confirm the reported behavior.