I deleted the data where the explored regions are stored and kept my progress, then I updated the world to version 1.18 and went to look for the portal at the end, but when I entered, I saw that the portal and the dragon were not generated.
Portal to go to the end /tp 1075.700 -33 1147.471
But when I recreate the same world, the dragon and the portal are generated.
Here is a copy of my World I cleaned before upgrading to 1.18 and 1.18.1-pre1
Thank you for your report!
We're tracking this issue in MC-231110, so this ticket is being resolved and linked as a duplicate.
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