[QUOTE]... this is when I charged my Pre3 on the wireless charger (touchstone), there was a strong magnetic field all around it (it was able to reset my electronic clock near it), and when the Jolla was around (about 50cm), it was bugging totally...[QUOTE]

This really sounds that your wireless charger (or Pre3) is not feeling well.
Sounds more like strong RF radiation than magnetic field, magnetic field in charger should be just coupled to the receiver coil, and even when nothing is charged, it shouldn't interfere anything, at least as far as in 50cm distance.

The RF noise of wireless charger should barely be able to block FM radio reception in close range.

curious Can someone test this?: Put phone on Qi charger, and try to listen FM radio with internal receiver. (Can't do with Jolla though)