you should contact mojang via the mojang support/help page. Submit your problem here:https://help.minecraft.net/hc/en-us/requests/new
notes :
If you lost world too, try to make sure to check the world file in your storage. Then go to the settings in minecraft, then the profile section, change the saved data from internal to external. But if you don't find your world file, it means you've never changed minecraft settings so that the world is saved on an external.
I added a video snippet for this problem.
more specific, chunks that fail to load are from y=-1 to y=-64
this shouldn't be a bug, you need to ask in the minecraft community, not make this report here
affect version 1.17.0
You can see it in the world by seed -1999277890 at the coordinates -1773 48 -794
[media]
On my nephew's smartphone. it also doesn't even show the mojang logo/writing at all