Even with connected TRRS cables and flashed I2C firmware is the behavior the same.
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Had to modify the rev2/rev2.h
Switching the keycodes for the right side:
k00, k01, k02, k03, k04, k05, k45, k44, k43, k42, k41, k40, \
k10, k11, k12, k13, k14, k15, k55, k54, k53, k52, k51, k50, \
k20, k21, k22, k23, k24, k25, k65, k64, k63, k62, k61, k60, \
k30, k31, k32, k33, k34, k35, k75, k74, k73, k72, k71, k70 \