After upgrading to 1.19.4, a crash occurred everytime when the redstone circuit worked (the cause of this is also unknown... I will report it in another post), so I downgraded again to version 1.19.3.

After upgrading and lowering the version (there was no change in the mode used before the version was upgraded), clouds do not appear above the sky, but in the underground cave (near y48).

The shader is not used, but if I use the shader, I can see that the clouds are normally in the sky.