Getting Intalled as false after sending push to device

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Hi,

We were using standard GCM implementation for our push notifications, we have now moved to Urbanairship FCM implementation and followed the steps in below link

https://github.com/urbanairship/android-library/blob/master/documentation/migration/migration-guide-fcm.md

The Push notification is working fine if user installs a fresh build from playstore. For some user who are updating the app from previous version stops receiving push notification and channel lookup suggest that the app is no longer installed on the phone. Please suggest if we are missing anythig

"device_type": "android",
"installed": false,
"background": false,
"push_address": null,
"named_user_id": null,

Thank You,

Himanshu