OK. I did skim through some of the Minecart bugs that were reported and did not see one a duplicate of the bug I am talking about.
Whenever I log into a my world I find that my minecarts, hopper minecarts, tnt minecarts, minecarts with a chest, etc., disappear. I though I was going insane but after the 5th time it happened I knew it was a bug.
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Thank you for your report!
We're tracking this issue in MCPE-21416, so this ticket is being resolved and linked 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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