Nothing harmfull but its there.
When You observe timeline and switch to filter section, then go back, some images of cards are flickering.
This occurs also when You are on timeline and some other app put something on top of the current screen.
Presented this in movie (observe the colored card on the left side, financial data are blurred on purpose):
Samsung Galaxy S9
Beta App version: 2.9.2+20902
Android version PPR1.180610.011.G960FXXU6CSG7