V9 Realtime Database listener stops listening after transaction

[jhuleatt]

[REQUIRED] Describe your environment

• Operating System version: macOS Big Sur
• Browser version: Chrome 91.0.4472.164
• Firebase SDK version: 9.0.0-beta.6
• Firebase Product: database

[REQUIRED] Describe the problem

The onValue listener stops listening for new values on a reference after a transaction.

Steps to reproduce:

Runnable repro is available in codesandbox: https://codesandbox.io/s/rtdb-transaction-update-repro-6u0qt?file=/src/index.ts

1. Click the "SET" Increment button a few times. The number next to Current value from RTDB is: will change as expected.
2. Click the "TRANSACTION" Increment button a few times. The number next to Current value from RTDB is: will stop updating ⚠️
3. Check the console logs. You'll see that every transaction completed successfully.
4. Click the "SET" Increment button again. The number next to Current value from RTDB is: still won't update.
5. Refresh the page. The number next to Current value from RTDB is: will be significantly higher from all of your previous clicks, proving that the transactions worked.

[schmidt-sebastian]

Thanks for the repro. I started looking at this and will report back in a bit.

[schmidt-sebastian]

Fix pending. Thanks for catching this. This was a bug in our listener unregistration.