I have the same issue with the same release version as you posted. I think the lip synch lag started 5 or 6 days ago. I had not made any changes to my setup which has worked fine for at least a year. I have no sound bar, just direct out from the Xfinity box to my TV via HDMI cable.
My TV is much older than yours and I have not been as thorough in testing as you have but the issue is it exactly as you’ve described and it was not initiated by any changes on my end. Thanks for posting about it!
BTW, I'm in the north bay of the San Francisco Bay Area in case that’s relevant.
It’s driving me crazy!!!
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