As stated in the title, shooting is paused when one hovers the mouse over the quest info, progress info, or locked players. It also becomes paused if you hover over the right user-interface (which may not be a bug, but I think shooting should continue even if hovering over the right user-interface).
ignore the spellbomb in the gif, I was just seeing if it also affects abilities (it doesn’t)
Edit: also note, I didn’t show that this happens for locked players in the video, but it does same as in the case of the quest info.