This is purely aesthetic, not a mission critical issue..
I have two apps that I run specific versions of, and therefore have to install from files. Both .deb files.
Both apps install fine, both have their actual icons in app view (gnome), both can be dragged down to the Dock, and both apps run just fine.
However when I start either of the apps I do not get a normal 'open indicator' on the docked app icon, I get a binary gear icon that pops up at the end of the Dock.
Not a critical issue of course, more of an ocd issue, but is there anything that can be done to the container or binary or whatever so the app icon of the containerized apps behaves like all the other 'native' apps pinned in the Dock?