No because both channels of the call are going through the PBX. That is what happens. The incoming call came into the PBX, that is channel A. If the call is transferred by the Misc Dest then that is creating Channel B to make the outbound call to the PSTN. Once the call is answered Asterisk is bridging the channels together. Just like any call. By disconnecting Asterisk you’re disconnecting the call.
This is how any PBX works, it just magically can’t pass the call to nowhere. It is both the destination (to incoming) and source (outgoing) of that call.