MeshSelfintersect and MeshRepair incoherences

I’m trying to clean up a large mesh (close to 2M polys), and MeshRepair reports faces that intersect each other.
Yet, when I run MeshSelfIntersect, even with tolerance 0, I get no result.
Also, MeshRepair reports the mesh as “BAD”, but the geometry is a “Valid Mesh”.

What are the criteria for un Invalid Mesh ?

Best

PS : I can’t share this mesh, sorry.

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