I tried to connect the same Thunderbolt2-to-GigabitEthernet adapter directly to the 14" M1 Pro MacBook Pro (by daisy-chaining to to the Apple Thunderbolt3-to-Thunderbolt2 adapter), and I get the same issue - the adapter can't get a DHCP lease.
I also have an Apple Thunderbolt2-to-GigabitEthernet adapter (dongle), which I tried to connect to the Thunderbolt2 port on the 27" Apple Thunderbolt Display, but I can't even get a DHCP lease on this adapter after the restart. With macOS 12.1 running on the 14" M1 Pro MacBook Pro, when the MacBook Pro goes to sleep and then I wake it up a few minutes later, it takes a while for the "Display Ethernet" connection to detect that it has a cable connected to it, and once it detects the cable, it can't get a DHCP lease so it goes to self-assigned IP address .x. I had it cabled to a switch and it worked fine until I upgraded to macOS 12.1. One of the monitors that I have connected to my 14" M1 Pro MacBook Pro is the 27" Apple Thunderbolt Display, which has a built-in Gigabit Ethernet adapter.
Last night I upgraded to macOS 12.1 from 12.0.1, and I'm having issues with Thunderbolt-based Gigabit adapters with the 14" M1 Pro MacBook Pro.
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