The bug
Attached blocks on end platform sometimes drop and appear on the ground when re-entering the end.
How to reproduce
Go into the End
Place a block on the starting obsidian platform, so that it's in the area that gets reset every time you enter the End
Place a torch, a button, a sign or something else that can just be attached to other blocks on that block so that it is also in the reset area. To be sure, place one on all sides of the block, sometimes it doesn't drop.
Leave the End.
Go into the End again.
→ Torches (etc.) that were attached on certain sides drop instead of getting deleted.
Related issues
is duplicated by
Comments

@unknown, if you don't have anything to add to the report, please refrain from commenting.

Issue seems to be fixed for 1.13.1.

Unable to reproduce for 1.13.1 too.

Nope, still happens. I just tried it with redstone dust, redstone torches (apparently only drop in two of the four directions), signs (might not drop on the side, my test isn't very clear, but definitely drop when on top), ladders (only two sides) and item frames (including content).
Can confirm that this is still an issue in 21w05b.

could the ender dragon destroyed it?
Can confirm in 21w06a.
Can confirm in 1.16.5 and 21w08b.
One year with no comments?