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In pymc-devs/pymc#6835 (released in PyMC v5.7.0) the emission of the "tune" stat was changed to be a sampler-wise thing, which is why McBackend can no longer find it in the stored sample stats.
This triggered a second bug in .to_inferencedata(), where a np.repeat was used instead of a np.fill, leading to an empty array, that masked away all draws & stats.