Reproduction steps:
1) Open "case_828824_Repro.zip" project
2) Build and run "asd" scene on any Android device
3) Tap Unity's loading splash screen few times
4) Stop taping and wait till loading will finish (Unity's splash screen will be gone)
-- Notice, that background's color is not default.
-- This happened because while Unity was loading taps were registered and applied on the first frame of the game (in result pressed the button which has changed the background color).

Expected result:
While Unity is loading, application should not register any taps.