I have the same issue. When my computer sleeps it's like power to the USBC gets cut and will not reconnect unless you unplug the external monitor for 5sec and plug back in. All the apps/ screens on the second monitor have to be quit and reopened because they hide in the background thinking they are still on the second monitor. Very frustrating, please fix ASAP apple.
tballgame
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Phoenix, AZ, United States