Attempting to enter or exit the Nether, but most often while exiting, will cause the game to crash. Chances of successfully entering the opposite dimension are perhaps 1/5 or so, maybe less in some instance. Entering a portal while the game is not auto saving seems to have no bearing on the chances of success. I am running a world created in pre-1.18. PS4 error code is CE-38700-8
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[Mod] EVGENSYPERPRO
This was a bug in versions 1.18.0 and 1.18.1. If you opened the world on these versions, it looks like it will no longer be subject to restoration as one of the users wrote https://bugs.mojang.com/browse/MCPE-149633?focusedCommentId=1124007&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-1124007
Perhaps this can be somehow solved, since it was not officially stated that these problems with the old worlds (PlayStation) are incorrigible.
GoldenHelmet
We are tracking this at MCPE-149866 now.
i have the same problem except it is with the end portal