To reproduce, one must hit the minecart with a flame arrow with a minimum pull. Pull to hard on the bow, and the arrow breaks the minecart.
I got this miecart w/ chest on fire by clicking to open it as I ran up to it, but I had the bow in hand and was just barely too far away to open it when I clicked.
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edit: Ok. I found that leaving the area, so the chunk containing the flaming minecart gets unloaded, puts the minecart out. But it will keep burning until that happens.
Can confirm this issue in 1.15.2
To reproduce, one must hit the minecart with a flame arrow with a minimum pull. Pull to hard on the bow, and the arrow breaks the minecart.
I got this miecart w/ chest on fire by clicking to open it as I ran up to it, but I had the bow in hand and was just barely too far away to open it when I clicked.
edit: Ok. I found that leaving the area, so the chunk containing the flaming minecart gets unloaded, puts the minecart out. But it will keep burning until that happens.