TNT is not ignited when right-clicked by a fire charge

What did i expect: Exploding TNT when right-clicking with a fire-charge.
What happend: TNT not igniting (just set on fire)
How to reproduce:
1. /gamerule doFireTick false (true will also work but then it will explode some seconds after)
2. Place TNT
3. Right-click TNT with fire charge
4. Won't ignite!
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I attached some screenshots. 2 of them shows TNT being set of fire with a fire charge, the other screenshot is TNT being set on fire, then ingnited with flint and steel.