I was testing the new 1.18.0.20 in a copy of my realm world, I came across some awesome new caves, but then came across chunks that didn’t load in, my idea is that the world was created but in 1.15 some time, and I think those chunks are unable to load in the new caves, but I hope this can be fixed,
here’s video of the missing chunks, video was too large to upload https://twitter.com/minecraftnews_3/status/1446141413356449794?s=21
Really think my world should be looked at, my world has a huge void hole if you go to -622 -35 1800, it goes on a long ways of unloaded chunks,
Here is the world, https://www.dropbox.com/s/isvuqytcte5t7d4/Realm%20world%20Copy.mcworld?dl=0
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If you have a copy of the world available, you might like to upload a copy of it for investigation.
On Windows 10 you can use the Export world feature.
On Android or iOS you need to use a file explorer to navigate to Device storage > games > com.mojang > minecraftWorlds
On Xbox or Switch the only way is to upload it to a Realm, and then download the world on Windows 10 or Android/iOS. (Please do not purchase a Realms subscription just to provide a world to us - but if you have a Realm already this may be a viable option if you wish to do so.)
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.

I can download it on Windows 10, but I will check if it does the same thing on Windows 10, As I played the world on Xbox in beta, I'll get the world uploaded on OneDrive and share it on here, and I will give you the cords on where the chunks are not loading,
MCPE-143851 describes your problem?

Thank you for your report!
We're tracking this issue in MCPE-98789, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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I don't know how it can be a duplicate when there are lots of chunks not loading and I think this should be looked at and not just forgotten, and I know I forgot to upload the world to this bug, I still would like my world looked at as I find it is a lot bigger in size of chunks not loading, I think there are hundreds of chunks not loading,

I still think my world should be looked at and this shouldn't of had been marked as duplicate,
https://www.dropbox.com/s/isvuqytcte5t7d4/Realm%20world%20Copy.mcworld?dl=0