Splash screen and Install dialog show black background behind app icon - icons

I'm having trouble with the icon that is shown for my PWA as:
splash screen icon
icon that is shown in the "Install app" dialog
See splash screen: (it's already fading out to the app a little bit, sorry about that):
https://i.imgur.com/rgLWDgg.png
And the Install dialog:
https://i.imgur.com/5GqpkGY.png
My icons (up to 512x512) are just circular, with transparent backgrounds. I created them using a PWA icon generator website. The icon looks like this:
https://i.imgur.com/xycHvyK.png
Does anyone know why the icon is shown with a black background in the splash screen and in the Install app dialog?
My app manifest declares both the title bar color and the background color as #fafafa (almost white).
Thanks for the help!

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