If you have a long/high enough wall, then some of the chunks behind it don't show. They are still loaded because entities still move, but the chunks are still see-through.
The way I replicated it:
1) create new world
2) Use seed: 6992403603823021898
3) Go to roughly x = -314 z = 112
4) Run the command /fill -314 114 112 -357 64 112 minecraft:stone_bricks
5) Fly at some height above the wall and go forward and backward across in the z direction (y = 128 gets it for me)
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violine1101
Thank you for your report!
We're actually already tracking this issue in MC-63020, so I resolved and linked this ticket 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 in the future to see if the issue has already been reported.
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