Cam grinder - All steppers, works well.

G53 - Noted, I just treat as work offset Position (easy, no effect on output). However I note that effect on simulator shows a major crash possible. I will adjust simulator in the latest update to move directly to safeX / Z position to avoid this. Still no effect on Output G-code, but looks better. I hope you know you can replace G28 with G53 X0 Y0 (or Whatever) in the Lathe setup.

Your Drill bush - Rough cut #32 for left hand tool causes this as cut length is within the threshold distance off the final rough dimension (Cut length around 0.02mm). Probably better for me to ignore this cut, will check if possible. (You can Just delete the whole block). This is an unusual way to machine this, and by normal processes this would not happen. Plunging in and cutting with the backside of the LH tool is a bit risky, especially on a mini lathe. Refer the attachments for my take on this (Tool # and Depth of cut adjust to suit). Note that Your DXF cut can be extended adding a value in the "Z AXIS MIN" box , say -26 to do this. Then add radius with parting tool, at part off.