I have the same sorts of issues on Android -- I frequently have to kill the 1.1.1.1 app because it no longer passes traffic, but it seems to work fine on other Linux systems that are not Android.
Alas not. We use it on our Linux machines with include mode and it's painful. Common domains fail to resolve at all, and can't even SSH to IP addresses on the local network. Every update seems to fix one edge case and add two more. At this point I'd rather just have a VPN and spend the buzzword budget on something else.
The Android issue is an issue, but a separate one. It seems to only happen on a few devices (including mine). What device do you use and on what version of Android?
