Answering an eMail as bcc - implausible reaction

[Peter_So]

I just noticed some surprising behavior in Thunderbird:
Person A sends an email to Person B, adding me (C) to the BCC list.
If I reply to this email, I would expect it to go from C to A.
In fact, it goes from A to B.
This behavior is reproducible and, to me, very implausible.

[siffemcon]

You could report it as a possible bug. If you do, please post the link to it here.