TNT ignited with a flint and steel does not count as killing an entity with TNT

In a loot table, the condition "killed_by_entity" with the entity type "minecraft:tnt" accepts killing an entity with TNT that was ignited with redstone or dropped out of a dispenser, but doesn't accept tnt ignited with a flint and steel.

Steps to Reproduce:
1. Make a loot table with the condition "killed_by_entity"
2. Make the entity type "minecraft:tnt"
3. Ignite the TNT with a flint and steel with the entity that matches your loot table nearby.

Observed Results:
The item under the condition "killed_by_entity" and entity type "minecraft:tnt" in your loot table is not dropped.
Expected Results:
The item under the condition "killed_by_entity" and entity type "minecraft:tnt" should be dropped. The item is dropped when the tnt is summoned, activated with redstone, or dropped out of a dispenser, but not when it is ignited with a flint and steel.