Can a ferrite bead accidentally rectify RF?
Not all beads behave the same, yet have the Mfg process and equivalent circuit of an inductor.



simulate this circuit &ndash; Schematic created using CircuitLab
I haven't seen one yet, but putting an FM signal over a partial saturated DC core with AC ripple might convert a strongly inject line carrier FM into AM. But is that just noise? or signal?   If it's signal, you better get the right ferrite.