Firestore onSnapshot() fails to complete on app restart

[L1b3rtyy]

• Operating System version: _____ iOS 14.4.2
• Browser version: _____ Safari 14.4.2
• Firebase SDK version: _____ 8.6.7
• Firebase Product: _____ Firestore

Steps to reproduce:

When my app starts, a snapshot is started (using the onSnapshot() method) on the document containing the current's user data.
My issue is that when I restart the app, this snapshot will "sometimes" never return any value, even though there is a document.
The only solution then is to kill the app (double click on Home then swipe up the app screen) and start it again, then everything works fine again.

How I restart the app:

window.location.assign(window.location.origin);

Logs (the SDK's logs are mixed with the ones from my app, I removed the irrelevant ones from my app):

LOG - [2021-06-22T14:33:15.403Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|377333871|null
LOG - [2021-06-22T14:33:15.401Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|377333871|1
LOG - [2021-06-22T14:33:15.360Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|965110029|null
LOG - [2021-06-22T14:33:15.344Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|965110029|1
LOG - [2021-06-22T14:33:15.179Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|291602727|null
LOG - [2021-06-22T14:33:15.178Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|291602727|1
LOG - [2021-06-22T14:33:15.177Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|__sak|null
LOG - [2021-06-22T14:33:15.176Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|__sak|1
LOG - [2021-06-22T14:33:15.174Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|591487729|null
LOG - [2021-06-22T14:33:15.172Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|591487729|1
LOG - [2021-06-22T14:33:15.170Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|290269970|null
LOG - [2021-06-22T14:33:15.169Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|290269970|1
LOG - [2021-06-22T14:33:15.167Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|709914748|null
LOG - [2021-06-22T14:33:15.166Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|709914748|1
LOG - [2021-06-22T14:33:15.165Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|__sak|null
LOG - [2021-06-22T14:33:15.163Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|__sak|1
LOG - [2021-06-22T14:33:15.161Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|185710931|null
LOG - [2021-06-22T14:33:15.160Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|185710931|1
LOG - [2021-06-22T14:33:15.158Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|272417711|null
LOG - [2021-06-22T14:33:15.156Z] @firebase/firestore:Firestore (8.6.7): SharedClientState|EVENT|272417711|1
LOG - [2021-06-22T14:33:12.973Z] @firebase/firestore:Firestore (8.6.7): SimpleDb|Opening database:firestore/[DEFAULT]/fireauthentest/main
LOG - [2021-06-22T14:33:12.972Z] @firebase/firestore:Firestore (8.6.7): IndexedDbPersistence|Starting transaction:updateClientMetadataAndTryBecomePrimary
LOG - [2021-06-22T14:33:12.967Z] @firebase/firestore:Firestore (8.6.7): FirestoreClient|Initializing OfflineComponentProvider
LOG - [2021-06-22T14:33:12.949Z] @firebase/firestore:Firestore (8.6.7): FirestoreClient|Received user=ZZNtKb3byiQsrHZ4I4A3IyfDZWL2
LOG - [2021-06-22T14:33:12.947Z] backenduser.setusersnapshot - uid=ZZNtKb3byiQsrHZ4I4A3IyfDZWL2
LOG - [2021-06-22T14:33:12.941Z] backendchat_stateless.getchatsbystate - ptcpuid=ZZNtKb3byiQsrHZ4I4A3IyfDZWL2, chatstate=10
LOG - [2021-06-22T14:33:12.941Z] backendchat.getchats ptcpuid=ZZNtKb3byiQsrHZ4I4A3IyfDZWL2
LOG - [2021-06-22T14:33:12.938Z] mylogin.mounted.onAuthStateChanged - user set
LOG - [2021-06-22T14:33:12.194Z] app.mounted - version=dev_0.0.1555, OS detected=iOS, appversion=5.0 (iPhone; CPU iPhone OS 14_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.3 Mobile/15E148 Safari/604.1

Notes regarding the logs:

• "mylogin.mounted.onAuthStateChanged - user set" is when auth.onAuthStateChanged is triggered with a valid user, hence the user is logged in
• "backenduser.setusersnapshot - uid=ZZNtKb3byiQsrHZ4I4A3IyfDZWL2" is when the snapshot is triggered

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[wu-hui]

Hi @olivierkrener

Thanks for reporting the issue and the logs.

The log does show there is a user signing in, however, the logs around snapshot listeners are no there. Can you check if there are more logs?

If these are all the logs you have, is it possible for you to provide a mini-repo, along with instructions. I did a simple repo, and do not see the error.

[google-oss-bot]

Hey @olivierkrener. We need more information to resolve this issue but there hasn't been an update in 5 weekdays. I'm marking the issue as stale and if there are no new updates in the next 5 days I will close it automatically.

If you have more information that will help us get to the bottom of this, just add a comment!

[google-oss-bot]

Since there haven't been any recent updates here, I am going to close this issue.

@olivierkrener if you're still experiencing this problem and want to continue the discussion just leave a comment here and we are happy to re-open this.