This section of site is for bugs with Java Edition's launcher. Head to https://bugs.mojang.com/projects/MCPE for bedrock edition or https://bugs.mojang.com/projects/MCCE for the legacy console edition.
This is not rendering related or a bug, this is just chunks not loading. If you have a slower PC, it might take a while for chunks to load.
Rohan Rajagopal
This section of site is for bugs with Java Edition's launcher. Head to https://bugs.mojang.com/projects/MCPE for bedrock edition or https://bugs.mojang.com/projects/MCCE for the legacy console edition.