firebase.database().ref("path").once("value") don't call callback

[HemrajLodha]

Issue

const ref = firebase.database().ref('users').child(uid);
            ref.update(user).then(function () {
                Alert.alert("success");
            }).catch(function (error) {
                Alert.alert("error", error);
            });

It's updating data in database but not calling callback.

Environment

1. Application Target Platform:

targetSdkVersion = 26

2. Development Operating System:

Windows 7

3. Build Tools:

Android Studio

4. React Native version:

react-native": "^0.57.1"

5. React Native Firebase Version:

"react-native-firebase": "^5.0.0"

6. Firebase Module:

database

7. Are you using typescript?

No

[Salakar]

Duplicate of #1498