The Bonemeal item in the Vanilla Ref Pack shows
{{ "minecraft:on_use": { "on_use": { "event": "fertilize_block", "target": "block" } }}If a creator where to use this it would crash the game.
The correct line should be
{{ "minecraft:on_use_on": { "on_use_on": { "event": "fertilize_block", "target": "block" } }}Using this code will provide the desired result
Comments 2
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Could you provide the path where you are finding the bonemeal.json? I do not see bonemeal or dye in the items folder for the vanilla behavior pack.