On Windows, I defer the Install prompt for my Brotkrumen PWA but when I invoke event.prompt() later, I see a black square with the letter "B" in it and not my Ginger Bread House icon. This also happens if I click the Chrome/Edge/Opera/Firefox native install buttons directly.
If I say yes to install, then I also only get the white B on black background on homescree or Apps folder.
On my Android phone, everything works with the gingerbreadhouse.png icon appearing in both the install-confirm prompt and in the App folder. Edge/Firefox/Opera browsers are "branded" or badged on top of icon. Chrome and Samsung are not.
I've cleared all Caches and seen that my debug/applicatio/manifest has the images displayed and my Fetch API handler serves up the image when the confirm prompt appears but no house is forthcoming.
The code is not minimized but all source can be found in GitHub
PS. Slight nit: - Chrome webkit says "Added to home screen" when it isn't. It's Added to the Apps folder.