https://bugs.freedesktop.org/show_bug.cgi?id=106111
--- Comment #6 from Radosław Szkodziński astralstorm@gmail.com --- This is still happening. It seems that these GPU need engine resets before bus reset, similar to what was done for Fury and Polaris, but more extensive.
Temporary workaround (yeah sure) is to eject the driver - rmmod in guest or eject in Windows. This resets the engines.
Windows did the resets on shutdown until version 18.5.1 where they broke shutdown sequence again - read release notes on Radeon Pro Vega FE drivers where they actually slightly care.