Yes, that was a bug that was introduced back around then and lasted a version of two, though for some reason it does not appear on the bug report list. Probably for this reason:
We had to use control-insert to copy help documentation text into the clipboard. I agree, it was very annoying. It has since been fixed and no longer exists in current versions. If you want the fixed MATLAB version, you'll have to upgrade to the current MATLAB version.