Diagnosing macos locking up when external displayport monitor connected
The dock has two DisplayPort ports, which are not present in the USB-C cable, so the hub must have some extra hardware providing this.

This may require drivers.  I have a Thinkpad USB-C dock home from work these days (corona) which require a DisplayLink driver installed on my Mac to provide video output from the dock.  It might be something similar here.

I would suggest reconsidering your Hub choice.  A simple solution may be the USB-C Digital AV Multiport-adapter (https://www.apple.com/dk/shop/product/MUF82ZM).