Please install my modified XposedInstaller(3.1.5) to properly detect Systemless Xposed.
The APK is signed by my personal key, you might need to uninstall other versions before installing mine.
The binaries are identical to builds downloaded from official links https://dl-xda.xposed.info/framework/, with the exception that app_process* is patched with the following command:
sed -i 's:/system/xposed.prop\x0:/sbin/xposed.prop\x0\x0\x0:g' app_process*