I don’t work for Sense, but I’m pretty sure that native detection works with changes in the patterns in the frequency domain, rather than looking at time domain patterns like you are viewing on your scope.
More thoughts on operation in the link below including some illustrations from Sense technical talks that highlight some of the parameters that are used to detect on and off transitions. Parameters like the change in RMS power on each leg during a short (maybe 1/2 second) sampling window, or the corresponding phase changes on each leg.
Please read and feel free to comment and question.