Parts of previously generated old worlds(Versions 1.17 and earlier) that have not been loaded for a long time are replaced by new worlds(Versions 1.18 and later) when they are loaded again

linktitlepetal_20230910_103905.mp4: https://url92.ctfile.com/f/50038192-974065786-e7cd06?p=3717 （Access password：3717）

Above is a link to the video,But it does require a password, which is shared on it.

Looking at the changes on the map in my hand, I can see that the sea and the land are clearly alternating, which indicates that the terrain is being replaced. The original old terrain and the traces left in it no longer exist, only the new terrain can be seen.

I have other worlds will also face this problem, this will cause me a great loss, hope you can fix this bug soon.