sameSite cookie issues with stats.wp.com/w.js

[kraftbj]

Steps to reproduce the behavior

In this particular case, I:

1. Started a JN site and view the Jetpack dashboard.
2. View the console.

What I expected to happen

No errors

What actually happened

Context

a8c tracks call in stats.wp.com/w.js which is the origin of these cookies.

Browser / OS version

Firefox Dev (92b9), macOS 11.5.1

Is this specific to the applied theme? Which one?

n/a

Does this happen on simple or atomic sites or both?

Probably both; should be happening with anything loading w.js.

Is there any console output or error text?

Yes:

Cookie “tk_tc” will be soon rejected because it has the “SameSite” attribute set to “None” or an invalid value, without the “secure” attribute. To know more about the “SameSite“ attribute, read https://developer.mozilla.org/docs/Web/HTTP/Headers/Set-Cookie/SameSite

Level of impact (Does it block purchases? Does it affect more than just one site?)

Medium. It'll likely lead to failure to track soon.

Reproducibility (Consistent, Intermittent) Leave empty for consistent.

Screenshot / Video: If applicable, add screenshots to help explain your problem.

[bobmatyas]

Reported on the forums here: https://wordpress.org/support/topic/cookie-has-been-rejected-for-invalid-domain-error/?view=all#post-16343075