I'm seeing the screen flash when I do the following:
1) Select and center on an object
2) Zoom in to a degree or less
3) Using the quick menu at the top left, quickly tap on the + and - back and forth (Stars or DSO) and you'll see objects and stars flash on then off
This is much easier to see on a tablet, as you see a lot more screen, but it's happening on phones too.
Samnsung Galaxy Tab 2 with Android 7 and Galaxy S8 with Android 8, both updated on SS6 Pro