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Reproducible Example

import pandas as pd

ind1 = pd.Series([1])
ind2 = pd.Series([2])
ser = pd.Series([1.23], index=[ind1, ind2])
print(ser)

Issue Description

If trying to create a series with a multiindex from two series I get a deprecation warning with pandas 2.1.1

DeprecationWarning: Series._data is deprecated and will be removed in a future version. Use public APIs instead.

Since I am not using _data explicitly it must come from inside of pandas. The only place I have found where this could come from is in the is_all_arraylike function where there is a hasattr(val, "_data") in the cython code.

Expected Behavior

I expect no warning and at least in pandas 2.0.3 this was the case.

Installed Versions