I tested on my OnePlus 8 Pro running LineageOS and the first app I found on the Play Store (aodNotify) seems to work as expected. Pure black, as if it was part

I tested on my OnePlus 8 Pro running LineageOS and the first app I found on the Play Store (aodNotify) seems to work as expected. Pure black, as if it was part of the "always on display" feature. I guess it could work differently on different Android "flavours".