I'm playing on a friend's realm server. We had a previous nether portal set up, I wanted to make one a little closer to where we are living right now. I made a new portal and entered it to go to the nether, it dropped me off at the original nether portal created when I went into the nether the first time (expected). I wanted to go back through to see which nether portal in the overworld it was now connected to, the original or the new one.
Once I did this, however, the game was stuck indefinitely on the "building terrain" chunk of the loading screen. I exited after a while and re-entered the server, and it still hung on the same point of the loading screen. I booted the game up on my Switch and entered the realm from there on the same account, it still hung on the same point. I'm trapped until I can get a hold of my friend and see if anything can be done on the server end.
I've seen similar issues to this on older versions after searching the bug tracker, but they are all dated.
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Same thing is happening to me on a realm, however, I have this new information...
LG Q6 running Android Nougat. Portals are linked correctly. Going from the nether to the overworld (ocean biome) is not a problem, however, I experience a LOT of lag at the ocean. When I attempt to return to the nether, it just stays at building terrain. If I exit the app and restart, rejoin the game, it begins with me in the nether. Another player confirmed that on a map, I showed as RED the entire time that the building terrain message continued to display. I will get others to test this same portal with different devices to see if same thing happens to them.
I just had another player test it with me on the nether side. The player DOES actually show up in the nether, but it still shows building terrain on that players screen same as on my device. (2nd device is a Vivo Studio Max). Definitely something buggy at play here. Note that I have tried breaking the portal on both sides, rebuilding, and relit the portals. No affect on the building terrain issue on attempting to return to nether via that portal. No other problems with other portals on the realm.
Added captures showing stuck player and building terrain message displayed by app.
Consensus on the realm is that players feel there is far too much lag and our world is only about a month or so old. We suffer continuous issues with chunk load lag, slow block breaking, and some players suffer incredible lag while near oceans or whenever there is a surplus of drowned and ocean mobs. Is the issue with the server configuration with realms? Could someone please provide specs on what is used to host realms bedrock? Has that configuration or spec been altered at all since realms was first released?

wonder if this is related to my issue https://bugs.mojang.com/browse/MCPE-42145

Same thing happened to me! I'm stuck on the building terrain screen no matter how long I wait!

Were you ever able to find a fix?

No fix except to exit game and restart. Then you can exit the nether side portal. Just really annoying.
Thank you for your report!
We're actually already tracking this issue at REALMS-1553, so we will resolve and link this ticket as a duplicate.
In this case a nether portal that is within one of these unloaded chunks will result in the issues you describe. If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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