Our team is having issues previewing on Google Chrome. We debugged this and it seems that the
io.prismic.previewSession cookie is being set without the SameSite attribute causing it to be rejected in the latest version of chrome and safari. This may be a regression from the fix here.
I added a screenshot of my cookies to this github issue where you can see the SameSite attribute is not being set for that cookie. You can also see there is a cookie being set with the key=SameSite and value=None which appears to be a mistake.
Let me know if you need any additional information or have any information about a fix.