Getting different splash screen (White and Black) on SEE 11.0.1 using same installation package.
Splash screen with BIOS Mode UEFI is not supported. If configured it is expected to see the Boot Guard in Black Screen and this is by design.
Splash screens is only supported with BIOS Mode Legacy
When setting up splash screen for BIOS UEFI mode, you will find the Bootguard with black background with no splash screen. This is by design and expected behaviour.
With BIOS Legacy mode, you will find the splash screen as expected.