I am using the latest Edge Canary build and have tried themes from the Chrome Web Store. Everything works perfectly except the In-browser theme not syncing with the selected custom theme. For example, when we install these themes in chrome, the In-browser theme syncs with the installed theme meaning that if we install classic blue or serenity, then the In-browser theme would be changed/kept light or if we install just black, then the In-browser theme would be changed/kept dark.
The issue is depicted in the following screenshots with Just Blue as the theme:
