Haunted Mansion "ring" returns

For years, an old queue pole broken off in the cement at the exit walkway to the HM has prompted people to think there's a diamond ring embedded in the ground (folks have invented a backstory about throwing this ring out the window above). It's not true, of course.

In 2006, this ring was cemented over and the area made smooth. A return trip last week showed me a surprise: the cement covering has itself been scraped away, and the "ring" is again visible. I wonder if there's a backstory to this, such as workers at the mansion uncovering what they perceived as a maintenance mistake?