When testing with minecarts being pushed by minecarts with furnace, tests runs well but at some point of the test, minecarts entered inside of each others and start moving indepently of the minecart with furnace and much more fast. It lags a lot when these carts are joined. Seems to work with all types of minecarts since they're coded with the same engine.
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I think this is a a duplicate, or related to my issue.
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It is related but you haven't said that they start moving independtly. You only said that game crashs when there are some of them.
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Duplicate of MC-14.