Trapdoors reset their open state when you join a map
Linked issues
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Hi Daniel,
Please remember to search before posting new tickets. This one is a duplicate of MCPE-11381. You could have easily found this by typing mcpe unresolved trap door into the quick search. By doing that, the bug tracker runs a search of all "unresolved" tickets in the "MCPE" project and searches for the words "trap door". MCPE-11381 would be at the top of the list 🙂

I am sorry for that.
I've searched "trapdoor reset" and other, haven't found that (because the search is horrible)

Daniel, I think you should look for "Trapdoor" instead of "trapdoor reset". Because, when you search "Trapdoor", it could increase the number of search results. Then change the platform into Minecraft Pocket Edition & Windows 10 Beta Edition, and do not always search with the status "open", because it could be the issue was resolved.
Hi Daniel,
Please remember to search before posting new tickets. This one is a duplicate of MCPE-11381. You could have easily found this by typing mcpe unresolved trap door into the quick search. By doing that, the bug tracker runs a search of all "unresolved" tickets in the "MCPE" project and searches for the words "trap door". MCPE-11381 would be at the top of the list 🙂