scoring and scoring_function don't match

I have just started using TPOTRegressor, and I found that when I change the value for "scoring", the value for "scoring_function" does not change. For instance, when I changed "scoring" to "r2", "scoring_function" remained "neg_mean_squared_error". I am assuming this is an error. Either way, I would like to know how to interpret my current best internal CV score, in light of this issue.

Also, when I change the scoring function directly by .scoring_function='r2', .scoring_function returns "r2", but my internal CV scores remain the same.