When pushed by player, multiple Minecarts inside of each other will cause them to continue moving, even when not on rail and will continue moving until they hit a block or an entity breaks or pushes them.
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Asteraoth
Thank you for your report!
We're actually already tracking this issue at MC-14, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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