From @Etonkovidova in T222833

In T222833#5266274, @Etonkovidova wrote:

There is a strange behavior for back button when the back button is clicked from Mentorship/Help popup.
@kostajh - need your opinion on

• whether the present behavior of back button is expected (and acceptable)
• could it be a regression of some sort?

1. Click 'Your mentor' module, then click 'Ask your mentor a question' (the same behavior for the "Get help with editing" module).
2. A popup form will be present - click on the Back button - instead of going back, no navigation action happens. Instead the forward button becomes active but clicking on it does not provide any navigation either.

The screen recording shows no navigation actions when back/forward buttons are clicked.

IMG_7737.TRIM.MOV278 KBDownload

3. If the back button clicked one more time - it goes back to the side menu that sometimes occupies the whole screen:

It's worth noting that the same problem exists for the help panel -- try editing a page on mobile, opening the help panel, then tapping back. (See also T215430)