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Flaky <code>test_collection.py::test_len</code>

testsUnit tests and/or continuous integrationUnit tests and/or continuous integration

Status: Open.

#12275 In dask/dask;

· crusaderky opened on Feb 4, 2026

da.to_zarr 2026.1.2 not backwards compatible with dask&lt;2025.12.0 with zarr_format keyword arg and component

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12265 In dask/dask;

· joshua-gould opened on Feb 2, 2026

Zarr writing chunk size warning logic is faulty

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12263 In dask/dask;

· omdowley opened on Feb 2, 2026

da.ma.masked_where causes serialization error with np.uint8 and np.uint16 arrays

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12260 In dask/dask;

· jerry-kobold opened on Jan 30, 2026

Dask Crashes With Index Out Of Bounds on Print

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12257 In dask/dask;

· ahmayun opened on Jan 28, 2026

⚠️ Upstream CI failed ⚠️

upstream

Status: Open.

#12252 In dask/dask;

· github-actions opened on Jan 24, 2026

<code>.groupby()</code> with <code>by=[&lt;boolean&gt;]</code> raises <code>KeyError</code>

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12251 In dask/dask;

· asddfl opened on Jan 23, 2026

DataFrame with mixed use of <code>index</code> and <code>columns</code> and <code>.loc[]</code> brings inconsistencies

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12247 In dask/dask;

· asddfl opened on Jan 22, 2026

<code>dask.dataframe.size</code> with <code>index</code> brings inconsistencies

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12241 In dask/dask;

· asddfl opened on Jan 20, 2026

<code>dask.dataframe.drop()</code> is invalid

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12240 In dask/dask;

· asddfl opened on Jan 20, 2026

<code>.sort_values(by='c0', inplace=True)</code> brings inconsistencies

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12239 In dask/dask;

· asddfl opened on Jan 19, 2026

<code>.nunique(axis='columns', dropna=False)</code> brings inconsistencies

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12237 In dask/dask;

· asddfl opened on Jan 18, 2026