Since .10 volume automation is broken here.
It seems to work fine when writing but when letting go of the fader Cubase forgets / erases certain points, breaking the curve that was just fine.
In the demonstration below I did the exact same thing twice - first time it worked, second time it screwed up.
So as you can clearly see it removes a lot of automation points when write is stopped leaving only two behind where automation punched in and out.
Got in on video: