Im currently in the nether and when i attempt to go through the portal it said "generating terrain" then the game crashes. Ive tried this 3 times. I dont have a screenshot or video of this currently
UPDATE: i made a copy of the world as i was in the nether and it spawned me in the overworld on top of my house, i tried going through the portal and back in the copy and it seems to work fine, but i want to use my original world.
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I am also getting this insane bug
I updated game while I was in the nether
I log in to world and as soon as I go through any nether portal my game says BULDING TERRAIN for a few seconds and then it crashes with bug CE-38700-8
After crashing 3 times I manage to get through but I spawn in a random location away from my nether portal
AND I had another bug when I went through a nether portal it crashed 3 times and the 4th try completely reset my overworld chunks

Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response.
Can you please attach a world in which this issue can be observed?
This ticket will automatically reopen when you reply.
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When the game crashes, are you holding a map in your offhand?

No I am not holding a map in my offhand
Update on bug:
Firstly I updated my world while I was in the overworld at time of update
The same issue occurs
i tried loading in a copy of it and the same issue is still there
it seems that my original world and all copies of it have the same issue
no other world of mine has that issue btw
only this world which is 572.1MB in Minecraft but 600MB in PS4 system storage
and another bug I witnessed it when I went through that other portal, the chunks got reset in the overworld and some chunks got conpletely deleted and replaced witht the new terrain which is not meant to happen to already loaded chunks
AND IT AFFECTS VERSIONS 1.18 and 1.18.1 on PS4

This may be fixed in the 1.18.2 Hotfix. Can anyone confirm?

Yes the bug is fixed
I updated a COPY of my world in 1.18.2 and it seems to be fixed. I can go through both nether portals and I experienced 0 game crashes.
HOWEVER the original world which was updated in 1.18 seems to be corrupted beyond repair
thank u Mojang so much for the quick fix and thank the Minecraft gods for adding a backup option

Thanks. I'm going to resolve this report, then, as a duplicate of MCPE-149193.

We are now tracking the continued crashing when leaving the nether on worlds opened in 1.18.0 and 1.18.1 at MCPE-149866.
Same issue, was in nether at time of update, after updating use of portal to return to over world crashes the game. Haven't tried backup copy, but tried dying to respawn at worldspawn in over world also results in crash.