It’s a free download on flightsim.to - search for ‘Input Viewer’.
I don’t know how Computational Fluid Dynamics works, but I DO know how to make a video about this!! Here’s a demo of the problem as it currently stands:
The obvious next step now would of course be to actually record and sing the “One Skid Blues”…
Fellow rotorheads come n’hear the news
The choppers are yawing to the one skid blues
Ain’t no input that we oughta blame ourselves for
It’s a fault in the math of that simulator…
Mwwhahhahaha… the OBVIOUS next step! 
We can sing that blues every time the helicopter twists away on one skid!
Hi! Can you give any other information please? By “it” do you mean the H125 or any native MSFS 2024 helicopter? In what ways did the helicopter fly better in SU3 than SU4?
This is still present in SU5.
When flying a helicopter with assist turned off, press the left and right pedals several times before takeoff.
This will prevent the sudden spin.