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I've setup a VM for work that requires Citrix Workspace.

https://www.citrix.com/downloads/workspace-app/windows/workspace-app-for-windows-latest.html

This program creates a bunch of indirect displays on the machine that break the logic in get_displays / set_displays / consistent_displays. The devices do not have any flags set for StateFlags (which according to MSDN, looks wrong).

A MRE of this scenario would just be to install the program and notice that the long contains 'No QXL Devices!' even though there is one. After uninstalling the program, vd_agent begins working as expected.