[BUG] PPSSPP can't save settings on Android 9

[LunaMoo]

@olddos25 the thing is, your problem is yours alone.

People with same device(ie me) never had such problem and can't reproduce it. A problem doesn't matter if small or big definitely will not be fixed by anyone that doesn't even understand why it happens, doesn't matter if they're experienced project leader or a random person walking by.
PPSSPP is open source, you have full access to source code just like anyone else and this gives you a choice, trying to understand the problem and fix it yourself as the person with highest chance of fixing it aka the person that can reproduce the actual problem or cry as you do and not accomplish anything outside of getting some internet hate trying to be some social justice warrior that thinks he's the most important person in the world for mere existing without doing shit for others to actually care about his existence.

Problem like yours could be caused by rippoff SD card with fake space on it(which are VERY common nowadays) or something else that could be specific to your system, maybe a vendor specific changes or some local/regional weirdness, maybe even a third party app doing something really bad, either way nothing will change the fact that you're affected while others are not.