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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>.unstack(sort=False)</code> reorders columns labels without the column values

Bug

ReshapingConcat, Merge/Join, Stack/Unstack, ExplodeConcat, Merge/Join, Stack/Unstack, Explode

Status: Open.

#62816 In pandas-dev/pandas;

· aallahyar opened on Oct 24, 2025

BUG: pd.read_parquet raises exception filtering on Period type columns

Arrowpyarrow functionalitypyarrow functionality

Bug

IO Parquetparquet, featherparquet, feather

Status: Open.

#62769 In pandas-dev/pandas;

· spillz opened on Oct 20, 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: Behavior change in pandas 3.x with <code>Series.resample</code> and <code>closed="right", how="right"</code>

Bug

RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas version

Resampleresample methodresample method

Status: Open.

#62200 In pandas-dev/pandas;

· TomAugspurger opened on Aug 26, 2025

· 

3.0

BUG: resampling with origin=end_date includes extra elements in the bucket

Bug

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

Resampleresample methodresample method

Status: Open.

#62154 In pandas-dev/pandas;

· vasil-pashov opened on Aug 20, 2025

BUG: Boolean Column Indexing Issue in Pandas

Bug

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

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

Status: Open.

#61980 In pandas-dev/pandas;

· tanjt107 opened on Jul 28, 2025

BUG: numpy_nullable NaNs do not round-trip through CSV

Bug

IO CSVread_csv, to_csvread_csv, to_csv

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

Status: Open.

#61617 In pandas-dev/pandas;

· jbrockmendel opened on Jun 9, 2025

BUG: Joining Pandas with Polars dataframe produces fuzzy errormessage

Bug

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

Status: Open.

#61434 In pandas-dev/pandas;

· juansolm opened on May 12, 2025

BUG: Python 3.14 may not increment refcount

Bug

Copy / view semantics

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

WarningsWarnings that appear or should be added to pandasWarnings that appear or should be added to pandas

Status: Open.

#61368 In pandas-dev/pandas;

· tacaswell opened on Apr 28, 2025

BUG: Inconsistency when converting week PeriodIndex into DatetimeIndex with astype("datetime64[ns]")

Bug

DatetimeDatetime data dtypeDatetime data dtype

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

PeriodPeriod data typePeriod data type

Status: Open.

#61177 In pandas-dev/pandas;

· dbalabka opened on Mar 25, 2025