Adding a comment in the Article editor will prompt an autosave and remove the highlight
Arsenii Kovsh
FYI update - for some of our team members, cache cleanup is a temporary solution indeed, as they experienced the same issue after a while.
Arsenii Kovsh
More details to the described issue: comment can be left while the highlighted word is yellow (about for 2 seconds, not more), and then the comment can be edited, but the catch is that the comment disappears in 5-10 minutes anyways.
Clearing "Site data" through the "Inspect" seems to be fixing the issue. However cannot be sure if this is a long-term solution.