Looks like your launcher is going a bit overboard and clipping a bit more than the “Minimum safe area” for maskable icons 
.
We mark PWA icons as Maskable by default, so they are allowed to be cropped by each launcher in order to not litter the homescreen with white background around the icons.
The trade-off is that you don’t have complete control over the final look, as it will be slightly differently cropped in every launcher.
You can see previews at Maskable.app
I kinda like how it looks on my Pixel
