Observation checklist submit button

As an observer, I have noticed that if you try and submit the checklist before all the fields are filled out you do not receive an error message. It simply doesn’t do anything and doesn’t tell you which question you missed/skipped over. Does anyone else experience this? On the contrary, the observed users completing the acknowledgement for the checklist do indeed receive an error if attempting to submit without filling out the necessary fields. Am I missing something?