Don't forget that the Pbank quoted capacity is for the LiIon cells, NOT for the USB output. So, that capacity should be scaled down by the ratio of cell/USB voltage, which is 3.7/5, which brings the capacity to 7700mAh.
Then, the efficiency of 3.7V to 5V conversion (about 80%) brings it further down to 7700*0.8=6216mAh.
Also, I wrote that the cam consumes 150mA from 12V (via HK3 kit).
When powered from 5V via USB cable, it consumes about 350mA.
So your estimated time to full discharge drops down to 6216/350 = 18 hours.
It's also depending on how old your Pbank is - generally, the LiIon cells keep the original capacity for about 200 to 250 cycles of full charge/discharge. The good news is that the lower the consumed current is the higher the actual capacity is. Nominally, the rated capacity is spec'ed for the discharge of C/5, meaning - for such current which fully drains the battery in 5 hours, which is in your case approx 1.2Amps. The actual discharge current of 350mA is much lower, so you can expect a bit more time out of your Pbank than I calculated above, provided the Pbank is fairly new.
Glad to hear that build 20190911 does the job. I spent quite a bit of time looking for the solution myself.
The bug in build 20190924 has been reported to VIOFO, and the reception of report was confirmed by their suport.