I run into this problem all the time as well. Weby works with Ctrl+V but not with Shift+Insert. I don't know why.
FillFromAllPages doesn't grab redirect pages when not using API
My suspicion is that a user copy/pasted the redirected-to page name out of their...
Actually, HttpUtility.UrlDecode rather than HttpUtility.HtmlDecode.
RedirectsTo function can return an html-encoded page title