Issue with "On form submission" Node: Unknown Webhook Error

[hundred98]

When using the “On form submission” node, I encounter the following error message most of the time:“Received request for unknown webhook: The requested webhook “b0d8cfa4-9f42-4e19-a84c-800aa03ed747” is not registered.
404 The requested webhook “b0d8cfa4-9f42-4e19-a84c-800aa03ed747” is not registered.”
Notably, this error does not affect the functionality of other nodes or workflows.
I have conducted the following tests to narrow down the issue:
If the “On form submission” node has no Form Elements configured, the aforementioned error does not appear.
If there is only one “On form submission” node in the workflow (regardless of whether Form Elements are configured), the error does not occur.
If the “On form submission” node has at least one Form Element configured, and there is an additional node (e.g., a “Set” node) in the workflow, the error will be triggered

as soon as the “Set” node executes.
Has anyone encountered this issue before? Any insights or solutions would be greatly appreciated!

Describe the problem/error/question

What is the error message (if any)?

Please share your workflow

(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:
• Database (default: SQLite):
• n8n EXECUTIONS_PROCESS setting (default: own, main):
• Running n8n via (Docker, npm, n8n cloud, desktop app):
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[hundred98]

workflow：

{
“nodes”: [
{
“parameters”: {
“formTitle”: “Title”,
“formFields”: {
“values”: [
{
“fieldLabel”: “word”,
“requiredField”: true
}
]
},
“options”: {}
},
“type”: “n8n-nodes-base.formTrigger”,
“typeVersion”: 2.3,
“position”: [
0,
0
],
“id”: “8562227d-b22e-4067-82e8-f3805930780f”,
“name”: “On form submission”,
“webhookId”: “b0d8cfa4-9f42-4e19-a84c-800aa03ed747”
},
{
“parameters”: {
“options”: {}
},
“type”: “n8n-nodes-base.set”,
“typeVersion”: 3.4,
“position”: [
208,
0
],
“id”: “adf63cba-45fb-478a-983e-20dcd50517f6”,
“name”: “Edit Fields”
}
],
“connections”: {
“On form submission”: {
“main”: [
[
{
“node”: “Edit Fields”,
“type”: “main”,
“index”: 0
}
]
]
}
},
“pinData”: {},
“meta”: {
“instanceId”: “69cf3063df3cdc73f31e3d57f67b1a5c1095c1a34e7ef43e8289326cd1f5f82a”
}
}