The bug
End portals can be activated again if you place eye at corner frames. The portal blocks are restored (if previously broken), and the portal spawn sound (minecraft:block.end_portal.spawn) even though the portal is already created.
How to reproduce
Make an end portal
Add an extra end portal frame in the corner of the end portal
Break a few portal block
Attach an eye of ender in the extra frame
→ You will heard the sound of end portal opening and the broken blocks of the portal will restored
Linked issues
is duplicated by 2
Attachments
Comments 12
It just activates the end portal again. If you break the end portal blocks inside and put an eye of ender in a corner, it will regenerate the portal blocks. This bug is actually quite old I think.
Can confirm in 1.21.
And not only the corner frames, extra frames in the interior of the portal can also activate the portal.
I can confirm that this is an issue. Also affects 20w49a.