When placing a minecart in a space where a minecart is already occupied, it will be placed but will not exist, dropping only the original minecart.
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duplicates 1
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Duplicate of MC-275224.
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We're tracking these issues in MC-275224 and MC-275219, so this ticket is being resolved and linked as a duplicate.
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It seems like you cannot stack minecarts with experiments enabled, leading to this happening. I still can confirm.
Update: This duplicates MC-275224.