This issue was reported by a customer. The issue occurs when pasting multiple paragraphs; if a font is selected, and multiple paragraphs are pasted, the paragraphs retain their original font.
This feature request is for there to be an option similar to MS Word's "Keep Text Only" pasting option, where the font of the pasted paragraphs will be whatever font is selected in Editor, as opposed to the original font of the copied paragraphs.