View Source doesn't work on Tor Browser with HTTP AUTH

Using TBB 4.5.2 on a .ONION website with Basic HTTP AUTH required

I'm authenticated in the website and surfing

I type Ctrl-U or right-click => "view page source"

The view source page appears, but ask me for a HTTP PASSWORD.

I type a working password, but no luck

The web server is receiving both HTTP requests (before and after I type some password) WITHOUT http auth

Trac:
Username: BenjaminSonntag