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I'm trying to do a G02 / G03 with a simultaneous "linear" move of a rotary axis (a,b,c) however when attempting to execute G03X0.0Z0.0B0.0R79.00000 the XZ motion completes, and then the B motion. Swapping the B axis with the Y axis allowed the Y axis (now rotary) to complete the move correctly.

I'm running 1.2113 with an AXBB-E

This is because this kind of motion is not implemented.
With G2/G3 codes you can do motion with the XYZ axes only.
So, the controller exacutes the XYZ circular motion first and then it completes the ABC linear movement.
The controller interpolates the 2 movements as separate motions.