I think there are multiple, I read an article recently where it was stated by an expert. But checking back now they don’t link any sources except the name of the expert, which seems to be a respected expert in the field, but that means nothing in the end.
This is one of the papers I could find within 2 mins, but I think there have been multiple papers on this.
https://www.nature.com/articles/s41562-023-01791-7
There has also been a lot of criticism on the original study that said blue light from phones was the issue, so there are probably a lot of response papers to be found about that.
AKSHUALLY comparing shadows across the Earth is a great way to prove it is in fact an oblate spheroid. The Greek mathematician Eratosthenes used shadows to calculate the size of the Earth over 2000 years ago and he got pretty damn close. He didn’t need to prove the Earth was round, because people weren’t idiots like some are these days.