Stern warning from Microsoft against using Chrome 78 Beta

Microsoft have known since (at least) July https://groups.google.com/a/chromium.org/forum/#!msg/blink-d...

tl;dr: Chrome's changing the default behavior of cookies without a SameSite flag to use SameSite=Lax. Previous releases defaulted to SameSite=None.

https://web.dev/samesite-cookies-explained

https://www.chromestatus.com/feature/5088147346030592

I don't think that's Chrome, 'cause the same thing happens to me under Firefox.