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BUG: SparseArray.map allows the fill value to be included in the sparse values #52095

Description

Pandas version checks

• I have checked that this issue has not already been reported.
• I have confirmed this bug exists on the latest version of pandas.
• I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

import pandas as pd sp = pd.arrays.SparseArray([1, np.nan]) mapped = sp.map(lambda x: np.nan) pd.isna(mapped.fill_value) True pd.isna(mapped.sp_values)[0] True

Issue Description

The current implementation of SparseArray.map allows the fill value to be included in the sparse values, causing potential problems.

Expected Behavior

SparseArray.map It should raise or recalculate the sparse array.

Installed Versions

Replace this line with the output of pd.show_versions()