WireCut should follow the CreaseSplitting setting, yes. I’ve put this bug on the list as RH-67032.
Note that, when using a closed curve, the result will be as expected.
Thanks,
-wim
Explode the polysurface into individual surfaces or ExtractSrf the desired surfaces as individual surfaces. MergeSrf with Smooth=No the individual surfaces into a single surface. The result should be a single surface with multi-knots along the creases.