Forwarding emails downloads remote content although TB was configured to block remote content

[cnmicha]

I set up a fresh installation of Thunderbird with no addons.

Thunderbird's default setting when receiving HTML messages with remote images is blocking the download of the remote content and displaying a warning message ("To protect your privacy, Thunderbird has blocked remote content in this message"). When forwarding that email, remote content is not downloaded (as I expected, because I have not clicked the "Show remote content in this message" button next to the warning message).

Now I installed the RWH addon. When viewing the message, the warning message still appears. But when clicking TB's "Forward" button, it starts downloading remote images inside the composer window...

I think this should not be the case.