The Bug
I am on a vanilla installation of 1.16.3 and made a nether portal. On one end, nothing is changed, but the other is blocked off from both sides. When entering the portal from the normal side, you get trapped in the other. You can still open the pause menu but not the chat so it is impossible to, say. call for help if you're on server or /home. Also, since I dont have a pickaxe, the only way out is to break an obsidian block with my unaided hands, as you must re-enter the portal to trigger it to the other side. This was tested on a vanilla single player world.
Reproduce
Build a Nether Portal
Go through it
Block both sides with obsidian
Go back to the overworld
Go back into the nether with the portal built earlier
Observed Result
You were trapped in the portal
Expected Result
You wouldn't be trapped
Linked issues
is duplicated by 1
Attachments
Comments 6
I think this functionality is intended (Not the trap but not going through) so you don't get stuck in a worse trap of endlessly teleporting through portals.
In 1.20 pre-1 this is kind of fixed, after travelling through the portal the animation no longer displays until you exit and re-enter, which makes it possible to open chat or your inventory while inside the portal block in this span of time.
However, the fact that you can get trapped by player-made actions doesn't sound like a bug, and in a regular survival world (no cheats) the "fix" won't make a difference.
Can you provide the world download.