[REQUIRED] Step 1: Describe your environment

• Xcode version: 11.5 Build version 11E608c
• Firebase SDK version: 6.25.0
• Firebase Component: Firestore
• Component version: 1.14.0
• Installation method: CocoaPods

[REQUIRED] Step 2: Describe the problem

After changing a connection from 4G to WiFi in the background, it seems that it spent long time (about 20 seconds) to reconnect to the server at when the app has become active.
Some documents are created while the app is in the background, then makes the app active:

• snapshotListener isn't called until about 20 seconds after
• query.getDocuments with FirestoreSource.server is failed with the error:

Error Domain=FIRFirestoreErrorDomain Code=14 "Failed to get documents from server. (However, these documents may exist in the local cache. Run again without setting source to FirestoreSourceServer to retrieve the cached documents.)"

If it is called with FirestoreSource.default, it returns results from the cache.

Steps to reproduce:

1. Activates an app with WiFi disabled. (4G is used)
2. Makes the app background.
3. Enables WiFi.
4. Creates some documents on firestore in order to make snapshotListener called.
5. Makes the app active
   -> After about 20 seconds, snapshotListener is called