[AndroidStudio] AVD - adbd cannot run as root in production builds

I had a trouble getting a root access to Android Studio Emulator (AVD), because I couldn't run adb root as following.
$ adb root
adbd cannot run as root in production builds

My device was Pixel 2 with the system image of Android 9.0 (Google Play). However, ADB root is not working on emulator with Google Play image.

So I created a new device, and for the system image, I selected one with GoogleAPIs, not Google Play.



When I tried again with the new device, I was able to successfully run adb root.

$ adb root
restarting adbd as root

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