"Share on LinkedIn" widget chokes on encoded spaces in url param

Question

Does anyone know why I am not able to include my own, URL encoded URL params with URL encoded spaces? See the URL on my jsBin page constructed from LinkedIn's example--I have added (%3FnestedParam%3Done%20space) at the end of the "URL" value.

THEN, if you remove the encoded space (%3FnestedParam%3DoneSpace) it works fine:

Try it out: http://jsbin.com/acosa3/3

Thanks!