So a couple years ago I saw a post about this and went flying around to see if it was a real thing and … turns out it is! It’s also represented here in FS2020 which was quite fun to discover this evening.
Here I am flying over it in real life. (YouTube link)
And here’s the in-game version of the crop circle:
(Fly KLVK - Livermore Municipal Airport to 63CN - Meadowlark Field)