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I just updated to Monterey 12.0.1. I have an iMac Retina 5k, 27-inch 2020 w/3.6Ghz 10 Core Intel Core i9; and have lost second display functionality. Both screens flicker on an off repeatedly when second monitor is connected to Thuderbolt port.
I got it to work!
I tried in Safe Mode and my external monitor worked fine. Restarted in normal mode - still same issue and I noticed my machine wouldn't SLEEP.
I found this article (https://michaelkummer.com/tech/mac-sleep-fix/) which suggested to reset the NVRAM and System Management Controller (SMC) by shutting down the Mac and turning it back on while holding the opt + command + R + P keys.
I did this with all external USB-C (except power) disconnected, logged in and plugged in my monitor.
Don't know how long it will last, but it's working now.
Did the latest updates May 2022, no, 2 external monitors on mac mini don't work unless I unplug and replug them in after restarting computer.
Monterey 12.0.1. Second Monitor Issue
