Issues with minecraft:damage_source_properties.

I am trying to get a creeper to drop a custom drop when killed by tnt, however it doesn't seem to work. Also before you ask, yes, I did check Misode and it gave me the same thing. This is the code. The diamond and arrows are placeholders. { "rolls" : 1.0, "conditions" : [ { "condition": "minecraft:damage_source_properties", "predicate" :{ "source_entity": { "type" : "minecraft:arrow" } } } ], "entries" : [ { "type" : "minecraft:item", "name" : "minecraft:diamond" } ] }