Stacking tnt minecarts and detonating them acts differently than previous versions (Don't know if it's intended or not because there isn't any specification on this)
– What i was expecting (and what happens in versions BEFORE 1.12):
When you stack multiple tnt minecarts into a single block and then detonate them by making them crash into a block, all the tnt minecarts are supposed to blow up ALL AT ONCE.
– What is happening (ONLY happens in 1.12):
When you stack multiple tnt minecarts into a single block and then detonate them by making them crash into a block, the tnt minecarts each detonate 1 by 1.
To create this :
Place a rail
Stack a couple of tnt minecarts on that rail
Give the carts a slight push
Then make them crash on a block
Test on 1.12 and other version (other than 1.12)
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This also happens if you put 6 or more tnt minecarts in a row faced with dispensers with a block of lava inbetween. The first 5 will detonate all at once but the 6th or more will detonate seemingly after a random delay despite being hit at the same time with burning arrows arrows.
[media]
this design will detonate all 3 minecarts placed on the rails but expanded it behaves as I described above.

Is this still a issue in the latest version of the game(currently 1.13.1)?
If so, please add it to the affected versions, thanks!