Team's File - Word Document - IMPOSSIBLE to UN-highlight text after copy and paste out of Teams

We attach documents in Team's channels and many of them are Word documents.  We have a Word document in a Team's channel that has various parts of the text highlighted with different colors behind the text to point out different areas of concern.  If we select the entire document, copy it and then paste into a new Word document that is not in Team's, we absolutely cannot turn the highlighting off in the new document.  Can change the color of the highlighting to something else, but if we turn that new highlighting off it returns to whatever color it was highlighted in the Team's version.  We can turn the highlighting off in the document in Teams, but if we copy the contents into a different Word document, it's locked with those colors for life.