Vanilla Cloud Fix addresses two issues that I have with vanila clouds. The clouds are now properly centered on the player and correctly fade out of view at the edge of the sky. This resourcepack uses vanilla shaders and may not work correctly for future versions.

Minecraft versions 1.21.2 through 1.21.5 please use the latest version!! Vanila Cloud Fix (1.21.2 - 1.21.5) (v1.1)

Older Minecraft versions use Vanilla Cloud Fix (1.17 - 1.21.1) (v1.0.1)

When using with versions below 1.20.2, you will be told that the pack is made for an older version. You can safely ignore this and it should work!

Vanilla Cloud Fix is also on modrinth.
Note that some performance enhancing mods already correct for the cloud issues present in vanilla, so the effects of this shader can vary.

Features:

Vanilla clouds don't always appear to fade out correctly at the edge of the view. Vanilla Cloud Fix improves the fade out by properly scaling opacity with distance. View the results below.

The vanilla clouds are not properly centered on the player and have an inaccurate offset in the positive X and Z direction, as shown in the figure below. Vanilla Cloud Fix corrects this offset using an approximation of -7 to correctly center the clouds. View the results below.

This comparison uses real screenshots at Y level 600~ looking down at the clouds using a modified cloud shader.