Issues

• Zero-size bag sampling raises instead of returning an empty Bag

  needs triage
  dask/dask#12691 · Filter by author student-shivamm opened on Oct 31, 2026
  1

• Provide an exact internal_method for da.percentile

  needs triage
  dask/dask#12686 · Filter by author matthiasschabel opened on Oct 28, 2026
  1

• compute() truncates strings when blocks have string dtypes of different widths

  needs triage
  dask/dask#12684 · Filter by author headtr1ck opened on Oct 27, 2026

• fuse_linear_task_spec silently replaces a task when two truncated fused keys collide

  needs triage
  dask/dask#12681 · Filter by author tkrikoryan opened on Oct 26, 2026

• Comparing str.split output selected with .str[-1] to a string Series raises TypeError

  needs triage
  dask/dask#12667 · Filter by author asddfl opened on Oct 23, 2026

• Metadata generation fails after filtering with .astype(bool) and overwriting the filtered column

  needs triage
  dask/dask#12666 · Filter by author asddfl opened on Oct 23, 2026

• Comparison against a to_datetime-derived weekday raises an index alignment ValueError

  needs triage
  dask/dask#12665 · Filter by author asddfl opened on Oct 23, 2026

• AttributeError when rewriting a filter containing scalar False in an OR predicate

  needs triage
  dask/dask#12664 · Filter by author asddfl opened on Oct 23, 2026
  1

• KeyError in head after sorting by and dropping a temporary column

  needs triage
  dask/dask#12663 · Filter by author asddfl opened on Oct 23, 2026

• KeyError when projecting a suffixed join key after two merges

  needs triage
  dask/dask#12662 · Filter by author asddfl opened on Oct 23, 2026

• Silent row loss in join/merge/repartition when float index contains NaN

  needs triage
  dask/dask#12653 · Filter by author Jason10191019999 opened on Oct 20, 2026
  1

• idxmax/idxmin raise ValueError when a single partition is all-NA

  needs triage
  dask/dask#12651 · Filter by author Jason10191019999 opened on Oct 20, 2026
  1

• dask.array.map_overlap doesn't produce known chunks with chunks=None

  needs triage
  dask/dask#12640 · Filter by author juntyr opened on Oct 15, 2026

• "ValueError: Missing dependency" exception when dask arrays are modified before their re-use

  needs triage
  dask/dask#12634 · Filter by author maneesh29s opened on Oct 12, 2026

• dask.array.shuffle raises "Array chunk size or shape is unknown"

  needs triage
  dask/dask#12632 · Filter by author joshua-gould opened on Oct 12, 2026

• to_zarr(shards="auto") can lose data when concurrent tasks write to one shard

  needs triage
  dask/dask#12631 · Filter by author psgundla opened on Oct 12, 2026
  1

• isin on object-dtype columns coerces to strings: isin(['1']) matches the integer 1 (pandas does not), isin([1]) misses it

  needs attentionneeds triage
  dask/dask#12612 · Filter by author ptimizeroracle opened on Sep 28, 2026

• dask.array.linalg.lstsq raises LinAlgError on rank-deficient input (numpy returns minimum-norm solution)

  needs attentionneeds triage
  dask/dask#12610 · Filter by author francisco-dlp opened on Sep 27, 2026

• set_index splits duplicate index values across partitions when a list column is present and repartition(partition_size=...) precedes it (regression 2025.3.0 → 2025.4.1)

  needs attentionneeds triage
  dask/dask#12604 · Filter by author guozhans opened on Sep 23, 2026

• dask.array.reductions.nanquantile never dispatches float32 input to numbagg, forcing a much slower fallback

  needs attentionneeds triage
  dask/dask#12601 · Filter by author benritchie opened on Sep 17, 2026

• Index join with MultiIndex columns fails on the shuffle path: "columns overlap but no suffix specified: MultiIndex([('_partitions', '')])"

  needs attentionneeds triage
  dask/dask#12599 · Filter by author fbunt opened on Sep 16, 2026

• __version__ resolves to "unknown" when installed via conda due to missing __commit_id__ in _version.py

  needs attentionneeds triage
  dask/dask#12591 · Filter by author DeBoni03 opened on Sep 9, 2026

• da.from_zarr does not use shards (da.from_array does)

  needs attentionneeds triage
  dask/dask#12586 · Filter by author joshua-gould opened on Sep 8, 2026
  1

• da.to_zarr writes corrupt data when specifying chunks or shards

  needs attentionneeds triage
  dask/dask#12583 · Filter by author joshua-gould opened on Sep 4, 2026

• Support irregular array chunks using zarr

  needs attentionneeds triage
  dask/dask#12581 · Filter by author joshua-gould opened on Sep 1, 2026