There is a test track where a minecart drives a circle. I started the world and then the minecart went flying on always the same piece of the track. Then it went on the track again and in the next round same with flying and then on track. It also follows the downs/ups but 2 blocks higher than it should.
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Duplicate of MC-2758.
Seems someone had the same issue but had a Mod (https://mojang.atlassian.net/browse/MC-5004). I don't have any mods.