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BUG: <code>pd.concat()</code> produces invalid index when inputs have <code>Int64Dtype</code> index with <code>NA</code>s

Bug

Missing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolatenp.nan, pd.NaT, pd.NA, dropna, isnull, interpolate

MultiIndex

Status: Open.

#62903 In pandas-dev/pandas;

· jlumpe opened on Oct 29, 2025

BUG: <code>sort_index</code> failing on MultiIndex with label name when key is used

Bug

MultiIndex

Sortinge.g. sort_index, sort_valuese.g. sort_index, sort_values

Status: Open.

#62361 In pandas-dev/pandas;

· ldouteau opened on Sep 17, 2025

BUG: NaN categorical in multi-level column gets replaced in to_excel output

Bug

IO Excelread_excel, to_excelread_excel, to_excel

MultiIndex

Status: Open.

#62340 In pandas-dev/pandas;

· niclas-muller opened on Sep 14, 2025

BUG: MultiIndex union/difference not commutative

Bug

IndexRelated to the Index class or subclassesRelated to the Index class or subclasses

Missing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolatenp.nan, pd.NaT, pd.NA, dropna, isnull, interpolate

MultiIndex

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

setopsunion, intersection, difference, symmetric_differenceunion, intersection, difference, symmetric_difference

Status: Open.

#60642 In pandas-dev/pandas;

· ssche opened on Jan 2, 2025

BUG: Enlarging multilevel index fails if one or more level keys are None

Bug

MultiIndex

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

setitem-with-expansion

Status: Open.

#59153 In pandas-dev/pandas;

· micky-gee opened on Jul 1, 2024

BUG: Pandas column rename function now working for multilevel columns

Bug

MultiIndex

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

rename.rename, .rename_axis.rename, .rename_axis

Status: Open.

#55169 In pandas-dev/pandas;

· DavidKingGH opened on Sep 16, 2023

BUG: in a level of <code>MultiIndex</code> tz info is lost from labels that represent the same timestamp

Bug

MultiIndex

TimezonesTimezone data dtypeTimezone data dtype

Status: Open.

#54194 In pandas-dev/pandas;

· maread99 opened on Jul 19, 2023

BUG: MultiIndex label lookup with empty list indexers inconsistent wrt placement of indexer

Bug

Error ReportingIncorrect or improved errors from pandasIncorrect or improved errors from pandas

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

MultiIndex

Status: Open.

#54009 In pandas-dev/pandas;

· wence- opened on Jul 5, 2023

BUG: partial indexing a multiindex with repeated keys isn't consistent with desugared version

Bug

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

MultiIndex

Status: Open.

#53995 In pandas-dev/pandas;

· wence- opened on Jul 4, 2023

BUG: <code>fillna</code> specify duplicated column that is MultiIndex causes RecursionError

Bug

Error ReportingIncorrect or improved errors from pandasIncorrect or improved errors from pandas

Missing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolatenp.nan, pd.NaT, pd.NA, dropna, isnull, interpolate

MultiIndex

Status: Open.

#53498 In pandas-dev/pandas;

· yuji38kwmt opened on Jun 2, 2023

BUG: loc raising error for MultiIndex with bool indexer _and first level of object dtype_

Bug

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

MultiIndex

Status: Open.

#50165 In pandas-dev/pandas;

· toobaz opened on Dec 10, 2022

ENH: The behavior of indexing on a MultiIndex with a nested sequence of labels is deprecated

Enhancement

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

MultiIndex

Status: Open.

#49206 In pandas-dev/pandas;

· MarkoM-5 opened on Oct 20, 2022