Controller doesn't work (bluetooth and generic usb)

I have the BT-160 G910 Controller and the LG G3 (D855) phone with Android 5.0.
The gamepad and all the buttons work fine, but the triggers don't work. They are not even recognized when I try to change the button bindings. Other games can recognize the triggers just fine, but usually they label them L2 and R2 instead of Trigger0 and Trigger1.

Please advise how this issue was resolved. I understand ot was a duplicate, but the duplicate was never resolved and closed without action. I have a galaxy s7 on android 7 with a p910 ipega clone. All buttons work expect for triggers.

Feel free to add a comment to the parent ticket (MCPE-9615) - it will be reopened and looked into.