If a TNT Minecart travels over a fire (such as one caused by flint and steel) after coming off a Minecart track, the explosion leaves behind a TNT entity which can be picked up, thus duplicating the TNT.
I did not pick a Game Mode as it occurs in both game mode.
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Duplicate of MC-7896, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being resolved as duplicate.