FWIW, this was not fixed in Grafana 8.0.4. I noticed that the milestone for fixing it has now been moved to Grafana 8.0.5.
This is very unfortunate. The bug has been around for 3 weeks already, the fix was supposed to be in 8.0.3, then in 8.0.4 - and it’s still not fixed. I don’t know what the hold up is, but our visualization not working already made us miss an important report deadline.
I was hoping for this to be resolved quickly. I should have reverted to version 7.5 and blocked the updates of Grafana forever. 
Almost every single past update has either broken something or made things more inconvenient by moving the user interface elements around - but these were minor annoyances that I was willing to live with. But totally breaking an important visualization and not fixing it for weeks is really pushing the limits of my tolerance…