If you put a tnt minecart on a track, break that track and set the block on fire, the TNT minecart twitches back and forth and doesnt blow up any blocks that have a minecart track on them
I have a video of it here: https://www.youtube.com/watch?reload=9&v=gsWIojYipz8
Thank you for your report!
We're actually already tracking this issue in MC-7879, so I resolved and linked this ticket as a duplicate.
However, that ticket has already been resolved. That means that this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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