https://screenrant.com/big-bang-theory-contradicts-young-sheldon-germany-storyline/

Young Sheldon S6 highlighted how Sheldon couldn't have gone to the summer program in Germany because of financial reasons, but TBBT S11 confuted that.

Just saying but the family didn’t pay for the trip. The college dean and one of his professors Sheldon annoyed paid for the trip to be rid of him.