[Debian][Gnome 3.28.2] Application icons missing

[x2k13]

• [x] I think my problem is NOT with youtube-dl
• [x] I've verified and i assure that I'm running youtube-dl-gui 0.4
• [x] I assure that i am using the latest version of youtube-dl
• [x] Searched bugtracker
• [x] I've read the FAQs file

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What is the purpose of your issue?

• [x] Bug report

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Bug report

After installing youtube-dlg_0.4-1_webupd8_zesty4_all.deb, the only application icon that's appearing is the one in the overview (Windows / Super key). All the others are missing.

What operating system do you use ?

Linux 4.16.0-1-amd64 #1 SMP Debian 4.16.5-1 (2018-04-29) x86_64 GNU/Linux Gnome 3.28.2

List of actions to perform to reproduce the problem:

1. Install youtube-dlg*.deb (doesn't matter if via <apt install $path> or <dpkg -i>)
2. Hit Windows / Super key on your keyboard
3. Type "you", see the already marked application icon, hit enter and start YouTube DL GUI

What is the expected behaviour ?

After YouTube DL GUI ist started, the application icon should show up on the dock, the application's menu on the top-left corner of the screen and on the ALT+TAB switch panel.

What happens instead ?

After YouTube DL GUI ist started, the application icon doesn't show up on the dock, the application's menu on the top-left corner of the screen and on the ALT+TAB switch panel. Instead the following icon is displayed:

The necessarily needed iconset apparently is installed correctly in the systems default icons/pixmap locations:

[MrS0m30n3]

You should contact the maintainer of the DEB package.