Email cc and send me a copy issue

When I’m sending email using only “to”, it is working fine. But when I’m adding email to CC or check checkbox to send a copy of my email, it generating following error:

Email not sent to (unsubscribed / disabled).

Why I’m getting this error. Please give me solution.

Thank you.

Same Issue i am also facing in V13. Please let me know if you get any solution.

Added this as a bug in github:

do you have the solution for this? I am currently facing the same issue. The CC is not working on sending emails to those user emails