ActivityTransitionAPI Pending Intent not working in background

I am trying the Activity transition API to detect the user activity, it is working fine when app is in foreground, but as soon the get closed from recent app list, the detection of Activity is stopped. The broadcast receiver is not receiving any change in activity after app close.

Start by reviewing the Activity transition API usage and the broadcast receiver described in the issue. Reproduce the difference between foreground operation and removing the app from the recent-apps list, then verify that activity changes are still delivered after the app is closed.

Written by the indexing model from the issue text.