The Favicon functionality is broken.
It only works if specified for an App but not system wide.
More specific, these settings currently do not work:

Thanks for considering to fix that in an upcoming release! 🤗
Best regards,
Don
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@don.lent Thank you for the report! I have opened an issue in our backlog to get this resolved.
Adam Driscoll
PowerShell Expert and Software Architect at Devolutions