Yeah, I know the post processor is not properly tested, especially Fusion 360 vs some dedicated CAM packages. I guess what I meant was that the post processor always generates these arcs in its normal movements. The code generated by the post processor also works fine on my CNC router and in every g code simulator I can find. I have already edited the post processor a bit to suit my machine and intend on making a few more changes.
I have tried a Fanuc post processor that was recommended on another forum post for machines with limited memory. It generated the exact same code for the same operation pretty much. The same code that would cause the machine to lose its ship!
I got my first reply back tonight from local Mazak support. They gave me some lines of code to add directly after the arc but it did not help. Hopefully that eliminates something and leads to a solution...