Hey @jacobjohn90 did you ever get to the bottom of this?
My very simple app where I am not doing any preloading and not calling SplashScreen.preventAutoHide() or SplashScreen.hide() suddenly started doing this right after I upgraded from SDK 35 to SDK 36.
There was no flashing on SDK 35, but on SDK 36 there are one or two flashes when loading the standalone app on an Android phone.