I recently installed Evolution 3.40-1 from flathub, in order to get the latest app version on 20.04.2
The app works well, but when using the Mutiny layout, the app cannot be pinned to the dock... open the app from the launcher, choose pin-to-dock.
Log out and back in, and its gone!
I havent used any other flatpak apps, does this affect anyone else? Is there a workaround?