TNT explosion cancels the downward momentum of other falling lit TNT instead of accelerating it

I cannot reproduce this. When I ignite two TNT at nearly the same time, they each explode on their own timer. The first one exploding does not reset the timer of the second one.

TNT that gets lit by a an explosion has a shorter timer that TNT lit by redstone, dispensers, or fire, but it does not explode instantly. I am not seeing any change in behavior from previous versions.

What you are seeing may be specific to the build. Have you tested the exact same build multiple times in different versions?

I am not talking about the timer. I am talking about the Momentum.
The first tnt reset the Momentum of the one who did not explode.

I am not talking about the timer. I am talking about the Momentum.
The first tnt reset the Momentum of the one who did not explode.

Your report does not contain enough information to understand or reproduce the problem.
As suggested in the comment by GoldenHelmet, please try the build in different versions and locations.
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Steps to reproduce:
1 Build a redstone contraption that puts 2 ignited tnt in the same block and than relezes it in free fall.

Observed results: When the first tnt of the 2 tnt in free fall explode it will temporarely stop the tnt who still did not explode from moving reseting its velocity.

Expected results: What should happend is: the first tnt to explode should accelerate the velocity of the tnt who still did not explode.

I'm still not reproduce this issue, Can you could export and attach your affected world to see that created contraption?

Here is the world download

Yes Cannon is write wrong.

Here is the world download

Yes Cannon is write wrong.

Can confirm, reproduced on Windows.

Similarly to MCPE-180263 moving/falling blocks do not appear to be affected by momentum.