External emails don't appear as CC in subscriptions email

Since I updated to v0.48.6 in open source mode, external senders (without a user in Metabase) of subscriptions do not arrive as copied (CC) in the emails, that is, they arrive as BCC.

However, in my configuration CC is enabled because I need to carry a mail thread.

My email provider is AWS.

Can anybody help me?

Yes that's this change:

It was done for security reasons.