Before going forward with any chamfering, just do a By Numeric selection, at face level, for any polygons with more than 4 sides.  If you find any, you can decide how to fix them before continuing.  Sometimes it's just a matter of selecting a few verts and collapsing them, or target welding.  If the number of sides of any polygon is an even number of vertices, then you can quad it up no problem by cutting edges between the verts.

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