Hello Railway Support Team,

I've been using the Slack Webhook Notification in my project for several months without any issues. However, a couple of days ago, I stopped receiving notifications. I've confirmed that my Slack App is enabled and running correctly, so it appears the issue may be on Railway's side.

When I navigate to Project Settings -> Webhooks and click on "Test URL," the HTTP request fails with a 400 status code. The error message returned is:

invalid_blocks_format

Upon inspecting the request, I discovered that the error is due to Railway sending a "null" item in the array of blocks. If I remove this item and re-send the request using cURL, it processes successfully.

Could you please investigate this issue? It seems to be related to how the payload is being formatted on Railway's end.