Hello,
OxygenOS 5.1.7 - Oreo 8.1.0, I converted the ROM into a microG rom, and replaced the google keyboard with simple keyboard.
I was testing the OnePlus Facelock and rebooted the phone, when I came back to the screen I was presented with a password screen, maybe you are familar with the OP Facelock, you set it up also with a pin, pattern or password. Since I was at the password screen to type in the pass, Simple Keyboard would not appear.
I rebooted into TWRP removed Simple Keyboard and pushed LineageOS' AOSP keyboard LatinIME to /system/app, then I rebooted and the AOSP keyboard worked at the password screen.
OxygenOS is a Google ROM, but I assumed any keyboard is going to work with all functions on the phone, and since OxygenOS is a google ROM, I assumed that maybe the AOSP keyboard might of had issues too, but it didn't.
Hopefully this is something you can look into without a logcat? I really want to have Simple Keyboard installed as the only keyboard on the ROM, but now because of this issue I've disabled Face Lock, which doesn't seem like a great way to resolve this issue.
I just don't get why AOSP keyboard would work and Simple Keyboard wouldn't... hmm
Thanks