Bulk statistics during feature detection produces wrong results for 3D data

[w-k-jones]

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As per title. e.g. np.max produces values smaller than the threshold. Works correctly when applied to a length 1 slice of the data. I'll try and dig into what is causing this at some point

• [x] Have you searched the issue tracker for the same problem?
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[JuliaKukulies]

note to @JuliaKukulies: have a look and see if this can be fixed for a version v1.5.5