I'm not entirely sure this is a bug, but more of a restriction on URL formatting for the website URL:
If I try to type:
www.some-site.com
I get an error saying not a proper URL.
However if I type:
http://www.some-site.com
it does work as expected.
It may be less than intuitive to some, but again very minor thing so maybe not a big deal and maybe desirable!
Lucas