This is supposed to work properly.
I'm using a similar setup on my desk: Dell D6000 + Dell D3100, combining the same chips you have. You can switch to USB-A and see if behaviour changes.
There is more than ample bandwidth. We were demoing 8x 4Kp60 at CES last January over a single connection. The dock is dual 4Kp60. A single 4K is 4x FullHD... I'm running out of money buying 4K displays before I run out of bandwidth. The codec we have is adaptative, so even if bandwidth was to become scarce, we would squeeze the data more to make it fit.
The USB-C bandwidth here is identical to the one over the USB-A connection. The dock has a USB 3 Gen 1 hub for 5 Gbps. The reason it's not a USB 3 Gen 2 at 10 Gbps is because it didn't need it and would bring the cost up un-necessarily.
If you keep getting issues, please do use our customer support tool to gather logs (3rd link in my signature). I use the feedback to prioritise bug fixing in new driver/firmware releases.
Kind regards,
Alban
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