System: MacBook Pro (16-inc, 2019) OS Version: Big Sure 11.5 Graphics: Intel UHD Graphics 630 and AMD Radeon Pro 5300M Same issue as above. Plugging in an HDMI or DisplayPort external monitor results in the system crashing and rebooting. This did NOT occur on this system on Catalina but as soon as I upgraded to 11.4 it started happening.