as you know i have the same issue and no solution for that for the moment.
But an other point:
In your printer.cfg you are using pin PB6 as pwr enable? I think its an own designed power switch isnt it? There is a “masterswitch” mosfet installed on the Trigorilla Pro B to enable the power for the heaters. Because of that you have to add following too.
[output_pin power_ctrl] pin: PB4 value: 1
I hope somebody can help us with our problem and we can find a solution.
I have tried to add an SPST between RST and GND but it seems to make no diffrent.