df = pd.DataFrame({'a': [1, 2], 'b': [3, 4]})
df.at[2] = [5, 6]
On 1.4.x, this gives
a b
0 1.0 3.0
1 2.0 4.0
2 5.0 6.0
whereas on 1.5.0rc0 it gives pandas.errors.InvalidIndexError: slice(None, None, None). I didn't any mention of this in the whatsnew, and a git bisect points at #47074; cc @jorisvandenbossche.
The docs of DataFrame.at explicitly say a KeyError is raised when the label is not in the frame. It seems to me this operation should not be supported, and can be considered a bugfix, but would be better to raise KeyError: label 2 not found.
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