Hello Ted R1
Welcome to Microsoft Community.
After reading everything you posted here, I noticed that all three USB-C Ethernet adapters are third party accessories from Excellon, Plugable, and SATECHI.
If you are looking to find out why Excellon's USB-C Ethernet adapter works on the Surface Go 2, but Plugable and SATECHI do not, unfortunately we may not be able to give any advice as they are not Microsoft products. We don't know much about their compatibility.
If our users have the need to use dock, we only recommend using Microsoft's official Surface dock:
Buy Microsoft Surface Dock 2 – Microsoft Surface
Because this is the best match for Surface series devices, they have the best compatibility.
Therefore, if you wish to explore the compatibility of Plugable and SATECHI USB-C Ethernet adapters, I recommend that you speak with the official support team of Plugable and SATECHI:
https://plugable.com/pages/support****
https://support.satechi.com/hc/en-us****
Disclaimer: These are non-Microsoft websites. The pages appear to be providing accurate and safe information. Watch out for ads on the site that may advertise products frequently classified as PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
Microsoft provides no assurances and/or warranties, implied or otherwise, and is not responsible for the information you receive from the third-party linked sites or any support related to technology.
I hope they can answer your questions and wish you all the best.
Best Regards,
Mitchell | Microsoft Community Support Specialist