My TG is installed as a binary from their website. Its folder contains only two binary files.
Browsing for other TG folders I didn't find anything containing icons.
Hicolor folder also didn't contain anything related.
To me it looks like its a bug in Zorin's taskbar notifications code, but lets explore other ideas, if any...
Can anyone using Zorin 15/16 with Gnome confirm how this badge is looking at their end?