Linus and Simon,
Thank you for your responses.
I did try "batctl ping" and the adjacent device was unreachable. I could see it with "batctl n". I did not try a simple IPv6 link local ping. However, I could see it using "iw dev mesh_5g station dump"
I agree that it feels like a problem with ath10k reporting the data rate incorrectly (or not at all).
I am going to try upgrading to the latest release, but it will be a few days. I'll let you know how it goes.
Thanks again,
--Joe