With enderpearl you can get behind the iron door, if you throw it on the block on which the door stands
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violine1101
Thank you for your report!
We're actually already tracking this issue in MC-2164, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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That is a really old glitch, and it has already been reported multiple times. Also, next time, be a bit more specific with the title if you want people to look into it.