https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
The above USB-C hub is put between MBA M1 (via Thunderbolt) and D6000 (USB-C data port). With the latest Mac OS and DL driver, this configuration works for both open and closed lid cases. For D6000, I also updated the firmware.
USB-C hub drives one display, ethernet, and etc, and D6000 drives two displays. Somehow, this configuration has been robust since I purchased MBA M1 back in January regardless of Mac OS and DL driver updates.
I hope this helps others struggling clamshell mode and other issues with D6000.