Indeed, I found the mention of the pass-through only applying to the
USB-C like a minute after I wrote my previous comment. Sorry for the
noise.

I don't have a C-A adapter at hand, but I've tried using the Dell DA200
adapter instead (not exactly the same thing as it's an extra hub, but
hopefully it helps anyway). So the topology is:

Dongle -> DA200 (hub) -> USB-C port on the TB16 -> AR host controller

/:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 10000M
    |__ Port 2: Dev 2, If 0, Class=Hub, Driver=hub/4p, 5000M
        |__ Port 1: Dev 5, If 0, Class=Vendor Specific Class, Driver=r8152, 
5000M
        |__ Port 4: Dev 3, If 0, Class=Vendor Specific Class, Driver=r8152, 
5000M

0f:00.0 USB controller: Intel Corporation DSL6540 USB 3.1 Controller
[Alpine Ridge]

This setup works fine without any corruption with all offloads on
(default).

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https://bugs.launchpad.net/bugs/1729674

Title:
  TB16 dock ethernet corrupts data with hw checksum silently failing

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