I had a world that had at least 30 hours of playtime, when I updated from 1.21.120.20-1.21.120.21, my world became terribly unstable. There would be chunks in my world that became dead-zones, frequent crashes in the same loaded chuck over and over again. I ran away from the chuck thinking other parts of the world would be fine, but no. It happened again-and-again, crash-after-crash, until I realized it was finished; I had to delete the world and start fresh. I built myself back up and after 10 hours while walking in a village; another crash occurred. Then another and another in the same area; I enjoy playing around with the new features in preview, but I have made real progress in these worlds, Mojang, please fix this; I don’t want to lose this world as well. (I am aware of back-ups and moving to stable instead).
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If you have a world copy available, you might like to upload a copy of it for investigation.
On Windows 10 you can use the Export world feature.
If the world is larger than 10MB you can upload the world to OneDrive or a similar file sharing site, and then share the link here.
Additionally, if the issue is ongoing, it would be helpful if you could also provide some additional information through Mojang Support.
Please choose Technical Support as the category, and Game Crashes as the subject. In the form, please include:
This bug ticket reference
Your Gamertag
A screenshot of your profile screen (Go to Minecraft>Settings>Profile, scroll to the bottom and take a screenshot of the IDs shown there)
(Please do not share this information here at the bug tracker.)
Would you be able to provide any more information about the crashes you are experiencing? Are there any error messages shown?
Also, to help us understand and reproduce the issue, could you please include details about your device and system (RAM, CPU, GPU spec)?
If you’d like you can also run dxdiag and copy the relevant information from there. (Win+R → dxdiag) - be sure to remove any personal information, just the PC specs would be useful.