Yep, I can't trigger the bug anymore in the latest beta, you're right. Thank you very much for that. I also experienced that chunk loading bug once or twice while posting, but it was so infrequent that I couldn't replicate it reliably. AFAIK it's fixed in the latest beta.
We run with a couple switch players, so for now we'll wait for nether plans until the beta goes live. Thanks again!
Yes, I think this should show it. https://drive.google.com/open?id=1AB3JKhBBpcLaDDOsVAtQTgY7lkmnB8wi
The portal at overworld coords 167, -267 on a floating raft was linked to one in the nether. Leaving the nether through that linked portal, or respawning at any bed on the raft (from the nether only) freezes upon loading into the overworld.
We've tried this with no resource packs loaded as well. Thank you!
Some additional information – we were also able to replicate the bug if you die in the nether and return to a bed that is in the same area as the portal we can't exit through. We can die and return to other beds in other areas, and to that bed from the overworld, but not that bed from the nether.
Might not be strictly portal-related.
We have the same issue here, and we can provide the world file if it helps. Two portals near to each other in the Nether, but when exiting through one of them the game sticks on Building Terrain for quite some time. Another player in the same game will see the victim appear in the portal in the overworld, and can even move them around by teleporting them, but "Building Terrain" persists.
The error only occurs when leaving the Nether, and only leaving the nether through one of the two portals, but it occurs every time you do so.
I was going to say this must have been a different problem from mine, since when I tried it on the beta build at the time it worked reliably, but we haven't used the world in a bit and when I loaded it up again to test it the problem's back. I shared the folder again with the below link. Sorry it's a bit large.
https://drive.google.com/open?id=1AB3JKhBBpcLaDDOsVAtQTgY7lkmnB8wi