I know that questions on porting to device **** are not allowed, so I will try to keep it as general as possible :
Q1: What is happening with the app displaying in the RaspberryPi 4 ? what do you think is the problem with that specific board that does not affect any other ARM64 board/device?
Q2: what new technologies you think would help in solve the above (Q1) problem ( maybe the new Mir 1.6 release and its initial rpi-dispmanx support?) and what improvement/problem could them introduce on other boards/device?
I don't know if this will be the last Q&A in 2019, eventually keep this in the freezer for the last Q&A:
Q3: what do you (realistically) wish for the project in the 2020 and what are you going to focus on?
ps: if this is the last 2019 Q&A wishes for a merry christmas