G03 is not cutter comp, it is simply a command to execute a movement with circular interpolation, instead of linear interpolation. Lots of programed paths contain arc movements which are perfectly legal with cutter radius comp turned on.
Cutter radius comp means the control compensates for the actual diameter/radius of the current tool and has nothing to do with arc movement commands.
Your description Txx Dxx M6 does imply some kind of invocation of calling a "D" value from the cutter radius register.
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