When upgrading Sodium from version 0.5 to mc1.21-0.6.0-beta.1-fabric, any options specified through the sodium:options custom metadata by other mods appear to stop working. Logs indicate that no overrides are found and the affected mixins of an option remain to apply.

The following is a portion of a fabric.mod.json file that should apply an option but does not:

{
	"custom": {
		"sodium:options": {
			"mixin.features.render.world.clouds": false
		}
	}
}

In version mc1.21-0.5.11, the following log would be printed:

[main/INFO] (Sodium) Loaded configuration file for Sodium: 42 options available, 1 override(s) found
[main/WARN] (Sodium) Force-disabling mixin 'features.render.world.clouds.WorldRendererMixin' as rule 'mixin.features.render.world.clouds' (added by mods [raisedclouds]) disables it and children

In version mc1.21-0.6.0-beta.1-fabric, the following log is printed:

[main/INFO] (Sodium) Loaded configuration file for Sodium: 43 options available, 0 override(s) found

Note that an invalid option (at least in 0.5) also prints a warning, indicating that this issue is not due to specifying an invalid option.

This was caused by one missing line; the next beta will fix this.