TNTs disappear when they are shot with a flaming arrow or trident and "TNT Explodes" is off

Steps to reproduce

1. Turn off the "TNT Explodes"
2. Place a dispenser facing into lava.
3. Put arrows or tridents in the dispenser.
4. On the other side of the lava, place a TNT block.
5. Activate the dispenser.

Expected result

The flaming arrow/trident lodges in the TNT block, and nothing happens to the block itself.

Actual result

The TNT block disappears.

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I was playing with Arrows and TNT just for fun, and found this strange bug. Even when I was shooting from large distances it occurred