Using Chromium Edge 88.0.705.74
Using builtin feature "Install this site as an App". Have been using this feature in Chrome and Chromium edge for a while
For sites that do not have a Favicon.ico, a black icon is substituted for the app.

Is there a method to update the Icon used by the app after creation?
You can see the icons with the User \AppData\Local\Microsoft\Edge\User Data\Profile 3\Web Applications and
\AppData\Local\Microsoft\Edge\User Data\Profile 3\Extensions\pljnpeboemcnaepgpabbgcanocamhghn\2021.2.11.40391_0\icons
Changing these icons does not update the app after creation.
Have reviewed the following documentation looking for clues with no luck: https://docs.microsoft.com/en-us/microsoft-edge/progressive-web-apps-chromium/



