TNT Minecarts never explode instantly even under right conditions.

DEVICE: Samsung Galaxy Tab A

TNT Minecarts never instantly explode even under the right (PC Edition) conditions. For instance: (Examples match screenshots)
1. TNT Minecarts do not instantly detonate after falling more than 3 blocks. (I believe it's 3...)

2. TNT Minecarts do not instantly detonate when destroyed while in motion.

3. TNT Minecarts do not instantly detonate when destroyed by fire, lava, or another explosion.

4. TNT Minecarts do not instantly detonate when they turn on a curved track too fast, with a solid block or entity located beside the track (in the previous movement direction)