Paste as plain text broken when "config.allowedContent = true"

[edwtests]

1) Extract CKEditor full

2) Use the following settings:

CKEDITOR.editorConfig = function(config) {
    config.allowedContent = true;
};

3) Open a page with CKEditor in it.

4) Use the paste as plain text button, and paste rich text from a webpage. For example, I copied the side bar content at ​http://msdn.microsoft.com/en-us/library/aa288454%28v=vs.71%29.aspx

5) The text is not inserted.

See screenshot. PS: Tried with version 4.3.1 too, no change.

[edwtests]

Screenshot