IPv6 failing after a few hours w/Netgear Orbi router

Well, this morning I turned IPv6 back on after having it off for around 2 weeks, as I was losing the connection even though all the settings looked fine on the RBR850 web page. I think this is the same issue others have reported, something has broken between Xfinity and Netgear on IPv6 (and neither company seems to be owning up to anything).

I turned IPv6 on at 7:30 today, less than three hours later I checked IPv6 again, and it's failing the IPv6 tests (see picture of one site test). The router web page shows a WAN and LAN IPv6 address, DNS is automatic from ISP,  IP address assignment is Auto Config. Everything else is working great on the network. I am running this test from a laptop direct wired to a switch to the modem (Netgear CM1200). I see the same thing from MacOS and from Windows 11 running in a Parallels VM on the same laptop. I am not running any special security or parental controls add-on packages. 

So I guess until or unless something comes down as a fix, I am leaving it off. I hope there is some progress in solving this problem, I have seen it for a couple of months as have others on reddit, netgear forums, etc.