Builder’s live editing works by iframing your site, when your site relies on specific cookies (e.g session cookie) to serve content and those are set as SameSite=Lax the browser won’t send them unless it’s on top-level frame (not iframed).
To workaround this, use our chrome extension which will detect if the sites within preview in editor it’ll process the Set-Cookie headers and make sure they have SameSite=None; Secure .
more info on the extension
Install it here: