When using Resend Receipt, I noticed that the BCC from the order type is not set.
The button triggers OrderReceiptMail::send($order), which by default sets params $to and $bcc = NULL. Inside the function, the To address is loaded from the order, but BCC is left alone.
I think that the BCC should be loaded from the order type in OrderReceiptMail::send(), so that receipt sends are always consistent.
Patch attached.
Active
2.0
Order
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Slight changes to the original patch. It applies for 2.36 ~ 2.40
When the email is resent, it doesn't necessarily make sense to resend to the BCC (which is why it was implemented that way).
You're free to alter the form itself if you want a different behavior. Also in the patch you're loading the order type even though this happens right after already.