Why did FSD drive right past the open Superchargers?

So here’s the story. I’m on the turnpike between Kansas City and Wichita, Kansas, and I need to stop at a charger. I already had one picked out through the FSD routing.

The car pulls into the turnpike service area at Towanda, where the Tesla chargers are. The Tesla chargers are on the far side of the service area. It drives over to the chargers. It literally drives right by the front of the row of chargers. There was one other Tesla charging at the time. Then it made a left and began driving off in a different direction, as if it somehow did not recognize the Tesla Superchargers.

The screen in my car showed the Tesla charging spots, and it showed that they were open. Yet it still didn’t make any attempt to back into one. It began driving off to a different part of the service area.

I stopped it, because I didn’t want to waste a lot of time wandering around the service area until I figured out where it was going. I pulled into a charging spot myself. But that seemed like very odd behavior to me.