Problem:
Movements timer on noise texture for clouds noise does not take into account the change of days as such, but only the time of day.

(In volumetricClouds.glsl)
float cloud_movement = (worldTime / 24.0) * Cloud_Speed;

Maybe fix:
float cloud_movement = ((float(worldDay)*24000.0 + worldTime) / 24.0) * Cloud_Speed;
Bonus with this fix - "unic" noise texture for cloud in differents days

good idea. clouds are in the middle of being developed (daily weather system is half done atm)
so barely any thought went into the movement.