If you select and copy to clipboard, say, the "ToDoList (AbstractSpoon) Support" header above and paste it into task (Rich Text) Comments, the copied text will be followed by two links:
ToDoList (AbstractSpoon) Support
Although it is possible to immediately perform an Undo (twice) to get rid of the links, after a few dozen of such usage pattern executions it becomes quite... hard to bear.
Generally speaking, pasting formatting-specific (thus context-aware) content into a Rich Text paragraph might have some merit, but enriching (thus changing) the original content that was copied is probably a bit of an anti-feature.
I would vote for some kind of a setting that would allow a user to paste copied content as: 1.) formatted content with links, or 2.) formatted content in its original textual form, or 3.) unformatted (plain text) content.