Yellow live pixel measurement does not track mouse outside ruler

[PhoenixIV]

When I move the mouse within the boundaries of the ruler there is a yellow line at the exact position of my cursor, telling me the measurement at that position. However, when I move the mouse outside the boundaries, somewhere right next to it where I want to take measurements, for example, the yellow line remains frozen at the position where the cursor left the boundaries of the ruler.

I would love the yellow line to track my cursor all around the screen.