@jpfbarreira

Operating System

Windows 11

Environment (if applicable)

Node.js version: 22.19.0

Firebase SDK Version

12.3.0

Firebase SDK Product(s)

Firestore

Project Tooling

• Framework: Angular (v20.2.4)
• Language: TypeScript (v5.8.3)
• Test runner: Playwright (v1.55.0)
• Firebase Emulator Suite (v13.16.0 via firebase-tools)
• Node.js (v22.19.1)

Detailed Problem Description

We are running end-to-end tests with Playwright against our Angular app.

What we were trying to achieve:

We want to simulate user permission changes in our tests by adding and deleting a manager document in Firestore. The UI should react to these changes by redirecting the user back to a summary page.

What actually happened:

Occasionally, the tests fail due to a Firestore internal assertion crash. Instead of the expected redirect, the app crashes with the following error in the console:

@firebase/firestore: Firestore (12.3.0): FIRESTORE (12.3.0) INTERNAL ASSERTION FAILED: Unexpected state (ID: ca9) CONTEXT: {"ve":-1}

Image

This happens only intermittently (flaky). Based on test runs:

First run: 30 tests -> 26 passed, 4 failed

Second run: 30 tests -> 25 passed, 5 failed

This means roughly 15–17% of our runs fail due to this issue. When it doesn’t crash, everything works as expected.

Context:

• The error occurs only when running against the Firebase Emulator.
• It happens when Firestore documents are added and deleted quickly (add manager -> delete manager).

We believe this may be related to: #8250

Steps and code to reproduce issue

We have not been able to create a minimal reproduction, as this error only appears intermittently (flaky) during our Playwright end-to-end tests against the Firestore emulator. However, the issue seems related to rapid document add/delete operations while listening to Firestore against the emulator.

The sequence that seems to trigger it is:

1. User is assigned a "manager" role -> Firestore document is added.
2. Shortly after, the manager is deleted from Firestore (document removed).
3. Our Angular app listens to Firestore snapshot changes and updates the UI.