Push notification body text is empty

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I'm integrating UA push notifications on Android with their React Native library.

When I try sending a push notification from the Urban Airship dashboard, I do get a notification on my Android, but the message content area is blank.

When I tap the notification it opens the correct app.

In logcat, I see the message content text that should be displaying in the push notification: 

HELLO THIS IS A TEST NOTIFICATION

ReactNativeNotifs: New message from GCM: Bundle[{com.urbanairship.push.ALERT=HELLO THIS IS A TEST NOTIFICATION, google.sent_time=1518420400840, google.ttl=2419200, com.urbanairship.push.PUSH_ID=<hidden>, google.message_id=<hidden>, com.urbanairship.push.APID=<hidden>, com.urbanairship.push.CANONICAL_PUSH_ID=<hidden>}]

I Spot - UALib: Received push: {google.sent_time=1518420400840, com.urbanairship.push.PUSH_ID=<hidden>, com.urbanairship.push.CANONICAL_PUSH_ID=<hidden>, com.urbanairship.push.ALERT=HELLO THIS IS A TEST NOTIFICATION, com.urbanairship.push.APID=<hidden>, google.ttl=2419200, google.message_id=<hidden>}
V NotificationService: pkg=com.myapp canInterrupt=false intercept=true

I noticed this error on push notification, not sure if it's related:

E MyApp - UALib: Received message callback from unexpected provider class com.urbanairship.push.gcm.GcmPushProvider. Ignoring.