Adding for posterity @avl that it appears that when a window's open for a while, even if the white bar does not appear (because I'm actively using that window), the display will become off-calibration with what's on the page, forcing me to move my cursor below where the link actually is to click on the link. The behavior fixes itself if I switch tabs.
I assume the problems are related.
I'd like to see this optional instead of mandatory as well, please. Opera for Android is the only browser that still lets me use Facebook Messenger from the mobile website, instead of having to use the basic mobile site or the desktop site, but this feature/bug is enough of an irritant that I'm also using Brave or Firefox more often, when I'm not going on FB.