I don´t know if this is a bug in Windows 10, but the Edge Stable and Edge Dev Icons if pinned to the Start Menu, don´t have any icons and are just text. Instead of the icon, there is just space/ a blank icon. (See screenshot)
OS Version: Windows 10 Insider Preview (Dev Ring), Version 2004, Build 20190.1000
System Type: x64
Edge, Edge Dev and Windows up-to-date.