I have a PL 2-6S BEC purchased from C&T on 8/30 that shorted after connecting a 6s battery. I normally run HS sensors and BECs and have never seen behavior like this, which is frankly pretty scary!
I routinely verify and test polarity and continuity before applying power, which I did before applying power to the PL BEC and sensor. A continuity check between the B+ and ground rails indicated an open as desired. The FC was disconnected before applying power, only the PL sensor was connected to the BEC.
Removing the BEC allowed the aircraft to power up normally – fortunately only the battery connector was damaged.
This is an existing aircraft with several hours of flight time without incident.