I will try to explain it again, what I think.
When accelerating from a corner you have: open front diff (defective locking system), locked centre diff (works OK), locked rear diff. (works OK).
In that situation Front and rear axle spin at same speed (locked c. diff) - rear axle works OK, - front inside wheel spins (because it is unweighted) outside rear wheel transfers same amount of torque (open f. diff) as inside one (very little or zero, if wheel is lifted)... effectively you have RWD.