I just went through that right before I posted. Was running stable, now 2024.07.08.1557. From the same Windows 11 PC as CDVR is installed, logged into HGTV (because that's what showed failed w/ cookie issue) via Xfinity. Got the live stream up w/ Xfinity secondary view-only login. Went back to CDVR and added the source and got the updated screenshot fail w/o cookie.
Update: As I was typing this, I tried again and it is now added 129 channels, so back to normal. Maybe should have waited longer.
I own a couple of AirBnBs so have logins to Spectrum, Xfinity and recently YTTV. I'm used to having issues with Spectrum making me change passwords and am dumping them for Frontier/YTTV at one of the properties. I know that Spectrum and Xfinity share technology and would gladly dump Xfinity as well, but it's included in the building fees.