Vibrant Visuals can be enabled in the global settings and works normally in general. However, when entering a specific world, the feature is automatically disabled.
The issue began after another player joined the world using a device that does not support Vibrant Visuals. Since then, the setting remains turned off only in this world, even after the player has left.
Are there any resource packs applied to the world? If so, does the issue still occur if you disable them?