Python macOS intermittent CI failure

[visr]

This happens somewhat regularly, that somehow the shape of a dataframe is different sometimes on macOS:

FAILED python/ribasim/tests/test_io.py::test_roundtrip - pydantic_core._pydantic_core.ValidationError: 1 validation error for Model
  Value error, Shape of passed values is (3, 5), indices imply (65536, 5) [type=value_error, input_value={'df':                   ...  <NA>  POINT (500 200)}, input_type=dict]
    For further information visit https://errors.pydantic.dev/2.10/v/value_error
= 1 failed, 50 passed, 1 skipped, 1 xfailed, 1 xpassed, 15 warnings in 27.00s ==

See for instance https://github.com/Deltares/Ribasim/actions/runs/12181851140/job/33979441871?pr=1959.

[evetion]

I saw this again on the NodeTable today (with empty init), again indicating that indices imply 65536 (max of uint16). The second run crashed (one worker), the third run worked like a charm. Not sure where this comes from.