The score keeps time with the click
The playing measure and the line moving through it no longer light up after the metronome's click: they now land with it.
While a song played, you heard the metronome's click a moment before the next measure lit up. It's a small gap, but it's enough to throw you off when you're reading along and playing to the click.
What changed
The score already waited for the sound to reach your speakers or headphones. But a screen shows a change a frame or two after it's drawn, and your eyes take a little longer than your ears, so a light and a click at the same moment look late. The playing measure, the line moving through it and the 4-3-2-1 count-in are now drawn just ahead of the sound, by about 60 ms on a normal screen and a bit more on a slow phone, so you see them as you hear the click.