This is quite self-explanatory. See the images below first.
The world chunks of Infinite Worlds fail to load on the Preview, but not in 1.18.33.
There is also noticeable performance drop in the Preview compared with 1.18.33.
However, there are no issues for Superflat worlds.
The Device is iPad Pro 2018 12.9-inch.
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This is so annoying especially when you're flying with the elytra and all of a sudden chunks stop loading. Really hope this gets fixed! I also noticed that there are sometimes missing chunks in the middle of perfectly loaded chunks.

Thank you for your report!
We're resolving and linking this ticket forward as a duplicate of MCPE-156737, as that ticket contains more detailed information and/or has already been triaged by Mojang.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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