Fixing a regression with `return_all_scores` introduced in #17606 (#17906)
Fixing a regression with `return_all_scores` introduced in #17606
- The legacy test actually tested `return_all_scores=False` (the actual
default) instead of `return_all_scores=True` (the actual weird case).
This commit adds the correct legacy test and fixes it.
Tmp legacy tests.
Actually fix the regression (also contains lists)
Less diffed code.