Bug: fixed background image problem with disappearing navigation bar (mobile)

Hi, I'm using a fixed background image aligned to the bottom.

background: url(image.jpg) bottom center no-repeat fixed;

Now there's a problem with Edge Chromium for mobiles and its navigation bar at the bottom which is hiding when scrolling down the page.

When this bar disappears the background image stays in position and doesn't move down to the new screen margin. You follow?

Seems to be a bug. Chrome works fine.

45.01.4.4920 + 45.02.4.4926