UE4 Freezes when ran with -DX12 arg on laptop running 2080 MaxQ without secondary screen

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Same here, including the release version of 4.22.

Laptop is a Razer Blade 15, with an RTX 2070 MaxQ.

It also happens when using a thunderbolt dock (Razer Core X) with a Quadro RTX6000 installed, and connected to a 4K monitor.