N8n 2.1.0+ form trigger stuck and spinning

Describe the problem/error/question

Checking if anyone else is experiencing the same issue. I’m hosting n8n with a postgre container and a cloudflared container using Docker in the same Docker bridge network.
The Form trigger was working previously on n8n 2.0.2 version.
After I upgraded the n8n instance to 2.1.0+, the Form trigger is not working when i remotely execute it. When you click the submit button, it will keep spinning, but nothing happens.

I use cloudflared as a tunnel so I can remotely access my n8n instance.
And I’ve added the following environment variable - WEBHOOK_URL=’https://n8n.example.com
So the Form URL looks correct. It just looks like it’s not receiving any input submission.

If I downgrade the n8n instance back to 2.0.2, it will work again.

What is the error message (if any)?

Please share your workflow

Just a simple On form submission trigger node.

(Select the nodes on your canvas and use the keyboard shortcuts CMD+C/CTRL+C and CMD+V/CTRL+V to copy and paste the workflow.)

Share the output returned by the last node

Information on your n8n setup

  • n8n version: 2.1.0+
  • Database (default: SQLite): Postgres
  • n8n EXECUTIONS_PROCESS setting (default: own, main):
  • Running n8n via (Docker, npm, n8n cloud, desktop app): Docker
  • Operating system: Ubuntu

It looks like to be a known issue: Form trigger always looping · Issue #23262 · n8n-io/n8n