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I'm trying to create a dungeon with a minecart puzzle. The puzzle consists of sending a minecart down a track and filling it with tnt at each station. It would then blow up a door at the end of the track to let players though. I have not figured out if its possible yet but I am experiencing an issue where I can not break minecarts I place on tracks in dungeon edit mode.

Here is a gif of me trying to break the minecart. I reload the dungeon, and I still can not break it. https://www.dropbox.com/s/9u9gtpgtle7hf2m/mythicdungeons_minecartissue.gif?dl=0