Same issue here. The only plug that didn't generate any issue was USC-C to USB-C between CalDigit 3 dock and monitor (Macbook PRO 2019 Intel + BENK 32` 4K EW3270U) Other plugs , Display port to display port or USB-C to HDMI caused CPU overload. Dock is connected to Mac via thunderbolt 3.
I agree with those who think it's a disgrace for Apple. I paid €4,700 for my machine.
Abpostman1
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Nice, FR