Embarrassingly, I went almost 10 days without realizing that my IPv6 Internet connectivity was not working.
Figured it out. I had updated packages on the router, and rebooted it. The router advertisement daemon (radvd) had its startup file moved back to start too early. (A race condition exists here. I need for radvd to start after all the interfaces have all of their IPv6 addresses.) I moved the daemon back to start much later. ‎- Julian

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