I upgraded a save to the new version, everything worked fine at first, but when I ran to the unloaded terrain, it loaded the new version of the terrain, when I got close, it had collision boxes, but no particles when destroying blocks.After a few moments, the new version of the terrain remove and restore the old version terrain.And when the new version of the terrain remove and restore the old version terrain,the game lags.

By the way, the old version terrain means the old version terrain that the player has been on

How to reprodunce:

1. Download the archive I provided below and import it into Minecraft Preview
2. Open the game and play a save called "BugWorld"
3. Move further away

Expected Results:Terrain will display normally, and do a perfect connection to the old version of the terrain

Observed Results:The new terrain is displayed at a distance from the player, then suddenly removed and replaced with the old one

Note

1.This Bug does not appear in the latest version 1.19.83

2.I do not use any add-ons.

3.This bug will only appear when you upgrade your old Minecraft save to the latest Minecraft Preview 

I put onedrive link,it include videos,photos and save file

https://1drv.ms/f/s!AtgH2H8rIyVth2bXFCWzx1RokyUd?e=1LFMgT

and QrRXZAOtAQA= is save file

Seed:455