Per the RG552, I'm kind of stuck on that. I tried installing Android on my Anbernic 351M, but that doesn't seem to be working at all, so I ended up giving up on that. Regardless, it was running Android 11, so it probably wouldn't even be similar anyways.
I've also tried using an emulator with Android 7 to see if I could reproduce anything, but there's no real way to test SD card issues with the emulator, so I'm stuck there too.
The only other option would be to buy an RG552, but they're around $250 and I might have to wait for it to be shipped from China, so I'm not likely to do that either. For what it's worth, the Android implementations on these devices are kind of junk, which I'm guessing is what's going on here. So until I can get a hold of one of these devices, I can't do much of anything about it, unfortunately.