Bug in Annotate PDF viewer

How to reproduce:

When being student or teacher going to the assignment, and scoorling down to the bottom of the page, you see feedbacks and underneath we have the Annoate PDF- here if you push “View annotated PDF” we have the bug.

Next:

You cant push the forward arrow (next page) however you can push on the field page (Page 1 of 5) and go to another page, you even can go back form this but not forward.

I hope you will have the time to fix it soon.

Its been like this the last couple of versions now 4.3.2 and 4.3.3.