Additional question mark icon in Launcher when launching an app, and then the original disappears

I when I try to open Okular which I've installed using flatpak, I see these two icons in my launcher:

After a while the Okular icon disappears and only the question mark one remains. What could be causing this and what could be a fix?

I'm on Ubuntu 16.04.

2 Sorted by: Reset to default

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