Taxon Framework Relationship bug?

Can anyone help me understand why this many-to-many TFR is showing up as a deviation instead of a match?

I’ve double-checked, and it has the same taxa at the same ranks with the same parents both internally and externally. What am I missing?

It looks like many-to-many is automatically a deviation:
https://www.inaturalist.org/pages/taxon_frameworks

Is there a reason you chose that instead of individual relationships for each taxon?

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Efficiency and convenience, I suppose, when dealing with subspecies of a single species.

I know that is one way to create a deviation. But I could have sworn I had also seen many-to-many relationships before that were matches. I must be mis-remembering…