For whatever reason, a TNT Minecart when activated by an activator rail, it will not blow up any rails or blocks that the rails are directly sitting on top of. However, when a TNT blows up due to it running into a block, it WILL blow up like normal.
Watch the attached video to recreate both scenarios. (You may need to turn volume up)
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We're tracking this issue in MC-7879, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Duplicates MC-7879 🙂