When I use the command /setblock ~ ~ ~ end portal
This bug happened.
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Thank you for your report!
We're actually already tracking this issue in MC-161852, 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.
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Can you be more clear on what happend?
like, you can show pictures and such, but like saying 10 words on what is happening, is not really going to help.....