Strange simulation

I upgraded to CC 756 and made a job to cut a plug off for an inlay. The simulation seems strange. Instead of a pocket I got a bunch of concentric circles.

I unchecked the tool path and expected to see the pocket.

Here is the c2d file.

male_plug_clearing.c2d (168 KB)

Did they change something in CC 756 or is this a bug?

How did you define the tool #6201 Fly cutter?

Here is the custom tool database for the #601 Whiteside Fly Bit.

number vendor model URL name type diameter cornerradius flutelength shaftdiameter angle numflutes stickout coating metric notes machine material plungerate feedrate rpm depth cutpower finishallowance 3dstepover 3dfeedrate 3drpm
601 whiteside 6210 601 Fly Cutter 6201 end 1 0 0.25 0 2 3 0.25 0 10 80 16000 0.01 1 35 80 16000

Works fine when I change to a McFly:

check and see how that definition differs?

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