Me3. Working from home and when the MBP goes to sleep while in clamshell and connected to my external Dell 24" monitor 90% of the time it won't wake up and will eventually reboot.
"Sleep transition timed out after 180 seconds while calling power state change callbacks. Suspected bundle: com.apple.iokit.IOGraphicsFamily."
It's extremly frustrating, expecially since every time it happens it runs the risk of causing serious data corruption…
There were other panics as well but either previous macOS updates or turning on Do Not Disturb while sleeping fixed those. Hope 10.15.6 fixes this one though.
Same crap with the Mail app every once in a while just deciding to pop open onto the screen. Who says "it can wait till next year" for these things? Don't they pride themselves on quality products anymore?
Don't want to jinx it this early, but it seems it has been fixed. Finally…