Steps to replicate the issue (include links if applicable):

• Go to an article on Wikipedia, for example open the article Wikipedia
• Select the title Wikipedia but extend the selection area to include this image
• Do a copy action to save that in clipboard
• Now Paste the clipboard in a text area

What happens?:
Wrong clipboard is saved because it would be : "Toggle the table of contents Wikipedia"

That is, the first segment (i.e., "Toggle the table of contents ") makes the clipboard wrong.

What should have happened instead?:
We should make the ToC unselectable. This way, only the title of the article is selected in clipboard.

Software version :
Vector 2022 in Wikipedia

Other information :
One possible solution could be applying this style:

.vector-page-titlebar-toc {
  -webkit-user-select: none; /* Safari */
  -ms-user-select: none; /* IE 10 and IE 11 */
  user-select: none; /* Standard syntax */
}

I have tested this style in my css page and it works well.