Firing a wind charge item through lava and into a block of TNT will cause the TNT to fizz and explode but trying this on a TNT minecart will only push the minecart forward rather than blowing up.

Steps to Reproduce:

1. Place a rail and a TNT minecart on it
2. Place a lava bucket next to the rail
3. Fire a wind charge through the lava and into the TNT minecart

Observed result:
It doesn't ignite.

Expected result:
It ignites, like TNT does.