Oh, I am sorry I searched in my bug and didn't see that one, very sorry please excuse me.
But it has only ever happened in the realm sever but I have never done it outside of one I will have to test it in single player.
Yeah, I have only ever had a minecart disappear After travelling hundreds of thousands of kilometres away from said minecart.
Yes, when I tried it I did indeed sprint, but I also experienced the visuals shaking for the first few seconds of the glitched sprint. Very odd.
Thanks for the help though!
Minecarts do despawn I have had it happen before.
And no MC-8004 does not describe my problem, my minecart clips straight through the floor and down to the closest valid player location.