ofn-bend-path

[Ofnuts]

Ah, but there is some even if not obvious, below, 3 paths, from top to bottom:

• The envelope
  
• Bendiness 100% (red)
  
• Bendiness 0%
  

As you can see, bendiness 100% added tangents (at 100%, the tangents from from both anchors are exactly on the middle of the segment and so overlap). To quote the doc: "Note however that this curve cannot be exactly the same
as the one you would get by interpolating intermediate points (even if it will  be close)."