webhook events update calls, but after second update nothing happens

[appstarter123]

Hello,

I created this webhook:

{
  "webhook" : {
      "address" : "https://6a84-2a02-908-4b47-9180-00-f270.ngrok-free.app/webhooks",
      "topic": "products/update",
      "format": "json",
      "fields": ["id", "note"]
    } 
}

When I create a variant I recieve a webhook, when I again update a variant I recieve nothing. Every time if I update/create the same product twice then I dont revieve hooks. Only after the first call, so if I go to another product and create varaint then I recieve the webhook if I create again the same product a variant then I recieve again no webhook. Why ?