i recently had the same problem. i could select it in the hierarchy and duplicate it then delete the old one and rename the new one. thats what i had to do to touch the object (i couldn't highlight it in texture mode so it its a little different but the same thing)

I recently had the same problem I couldn't highlight it in texture mode.

What I did since I could select it in the Outliner was duplicate it then delete the old one, and rename the new one.