Snap to image file borders

I use image files as backgrounds in my drawings (maps etc), but from DS 2018 I have found that DS snaps to the image file border even when it is outside the view on screen. This makes DS almost unusable, so I have had to stick with DS 2017. I can see many other comments on this issue but no answers - is there a way to stop this happening? Can this be removed from DS 2019?

Thanks!