I know the issue. the point is that the variations of the products inside the bundle are not in a selection list, they are in label layout. Your plugin does not consider labels as valid selection so the message won’t disappear. if I change the product variation layout to list, it works.
It’s a pitty, because lists mean the user needs to tap the list first, search the option they want, scroll down, and then tap the option. Things are much smooth with labels (when dealing with not many variations, which is my case).