Normally, "Copy Link" is not available for links as they can only be copied.
Any other document can be either copied or copied as a link.
However, if both links and documents are selected, the "Copy Link" action is available and this causes problems when pasted elsewhere. When pasted, links are created to the normal documents, but the links will be links to a ".url" file, which cannot be opened.
To improve usability, links should always be copied, regardless of whether "Copy" or "Copy Link" is used. This way the links' functionality is preserved.