Test failures as of 0.11.4 on NixOS

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I'm seeing a number of test failures as of the latest version, 0.11.4,

=========================== short test summary info ============================
FAILED tests/test_concatenate.py::test_concat_dask_sparse_matches_memory[outer-only] - AssertionError:
FAILED tests/test_concatenate.py::test_concat_dask_sparse_matches_memory[outer-first] - AssertionError:
FAILED tests/test_concatenate.py::test_concat_dask_sparse_matches_memory[outer-same] - AssertionError:
FAILED tests/test_concatenate.py::test_concat_dask_sparse_matches_memory[outer-unique] - AssertionError:
FAILED tests/test_concatenate.py::test_concat_dask_sparse_matches_memory[outer-None] - AssertionError:
= 5 failed, 3265 passed, 23 skipped, 74 xfailed, 324 warnings in 89.90s (0:01:29) =

Full logs available here: https://gist.github.com/samuela/cb1e21408c78ff89726fcb2caf213532

Versions

n/a

Start with the five failing cases in tests/test_concatenate.py::test_concat_dask_sparse_matches_memory and compare their NixOS failures with the full logs in the linked gist. Investigate why the dask sparse and in-memory concatenation results differ in each parameterization. Done means the reported failures pass without regressing the existing test suite.