crash-2024-01-22_12.32.51-client.txt

Rendering some chunks or certain parts in the chunks are invisible and it's unplayable.

You need to use Fabric API 0.88.1 for Indium 1.0.21.
https://modrinth.com/mod/qsl/version/7.2.2+0.88.1-1.20.1

Closing issue: use the suggested version of Fabric API