Two start sync messages fire off for a service

[tamillaumudova]

Checklist:

• [ + ] I've searched in the docs and FAQ for my answer: https://bit.ly/argocd-faq.
• [ + ] I've included steps to reproduce the bug.
• [ + ] I've pasted the output of argocd version.

Describe the bug

We have a service with a presync hook that includes a db migration job. The trigger that sends slack notifications when a sync is running fires off for this service.

To Reproduce

We have the following logic to send the notifications for sync start messages to slack:

- when: app.status.operationState != nil and app.status.operationState.phase in ['Running']
  description: Application is being synced
  send: [app-sync-running]
  oncePer: app.status.operationState.syncResult.revision

When a service starts a sync, we have 1 message that notifies us on Slack about the sync start. For this particular service, we receive duplicate start sync messages every time.

Expected behavior

We receive 1 message for sync starting, instead we receive 2 for this service

Screenshots

Version

Paste the output from `argocd version` here.
v2.11.2

Logs

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