I set up something with water and signs (to block the water) over the void in the end (so it would be too far away for endermen to teleport to or from where I was building). I noticed that something strange was happening, and realized that Endermen can teleport onto signs.
I made a new test environment like in the screen shot and spawned an Enderman onto the endstone. I then shot arrows at it until it teleported onto the sign on the cobwebs. I'm pretty sure that Endermen are unable to teleport onto ONLY cobwebs, so they must be thinking they can land on signs when they can't.
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Can still confirm for 1.21 - Almost died to my enderfarm because of this, glad this has been reported
(solved with waterlogged leaves above the signs)
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been delivered.