This problem is similar to
When using the Nonzero 'standard' theme, items that are hidden from students are invisible in student view, but are not grayed out in teacher view. The only way a teacher can check which items have been hidden is to turn on editing, or switch to student view. This is can be frustrating and confusing.
It would be wonderful if 'standard' (i.e. what worked in 1.9) behaviour could be returned to this and other moodle 2 'standard' themes.