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Hello,

I've set up an Automation in Prefect Cloud to send a slack notification when a work queue becomes unhealthy.
I've used the same block (Slack Incoming Webhook, from the prefect_slack pip package) I have stored to send other slack notifications within the flows, which works fine.
However, when the automation is triggered it fails with the following error:

```The notification block was invalid: KeyError(\"No class found for dispatch key 'slack-incoming-webhook' in registry for type 'Block'.\")```
Is this a bug?