I see this device is actually using in-box UDL kernel module - so, EVDI and DisplayLinkManager are not required to support those devices. What you see is generic xfce crash caused by screen layout change, most likely.
I don't see signs of failures in kernel trace, UDL looks fine. It would be interesting to see what was sent to Canonical when xfce crashed - you could peek into /var/crash and check if apport saved a crash file there. This can give you some hints.
Cheers,
Michal
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