Question about Lenovo 40AC0135CH ThinkPad Thunderbolt 3 Dock

Attention two 4K displays do not work (they are mirrored) - because Apple does not support the MST function.
https://discussions.apple.com/thread...

Yes

I have been using the dock for a long time with a MacBook Pro 2016 15inch with Touch Bar and it works great. I have connected a 4K monitor to the dock and another one via an adapter from USB-C to DisplayPort, as I couldn't manage to get them both to work directly via the dock.