Having the same issue. Highlights will randomly go Enabled when no script will change it. They also will also stay Enabled visually when you exit Play Mode. It’s very frustrating. I can’t include Highlights which will be a core component to my game until they fix this.
This may or may not be connected to @KizmoTek’s issue regarding Highlights, thought to share it nonetheless. Could be the same issue or might require another bug report.
Anyways, if you take something that has a Highlight and move it into a folder, the Highlight will break. (stops rendering in studio and in-game from my experience) The only way to get the Highlight to correctly render is to delete the Highlight and make a new one. (copy and pasting would do the trick.)
I believe this to be partially the issue shown in the original post.