Hi Aron.
I’ve encountered a bug with the seeker editor.
It seems that if I change the default valid tags from everything to some random mask, save everything (in our case in a prefab) the mask will be saved properly.
However, after that, trying to change the mask back to “everything” will not dirty the component, and won’t cause the prefab to be saved with the new values.
I’ve had to manually call EditorUtility.SetDirty() to get it to save.