The option "isAccessibilityTool" must be placed here:

1. Inside the manifest file:
   <application android:label="AccessibilityDemo" android:isAccessibilityTool="true">

2. inside accessibility service resource file:

        <service
            <meta-data
                android:resource="@xml/resource_file" />
        </service>

resource_file content:

<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"
     ...
    android:isAccessibilityTool="true"
    ... />

Thanks.

Extended PR for that as well - same deal, not able to replicate an issue thus far.