Facebook One Box Error

Facebook One Box Error on Latest 2.7.0.beta1 version.

ErrorUtils caught an error:

Failed to set the ‘domain’ property on ‘Document’: Assignment is forbidden for sandboxed iframes. [Caught in: Module “lowerDomain”]

Subsequent non-fatal errors won’t be logged; see https://fburl.com/debugjs.

Same error show when I do F12 on following post.

Can you provide an example?