Hello.
When viewing forwarded bug reports in the web page, the message that
indicates forwarding to a URL, adds a quote at the end of the URL, and
thus, makes it invalid.
The forwarded message at the beginning ("Forwarded to...") gets it right.
For example, view Bug#33808.
Search for "Set bug forwarded-to-addres". The URL shown is:
(with a quote at the end).
Best regards,
Mauro.