Programmatically created webhooks are not shown in the UI

Hey, I've created a webhook using a POST request, following this page: https://docs.microsoft.com/en-us/azure/devops/service-hooks/create-subscription?view=azure-devops
and the created webhooks are not shown in the `service hooks` tab in the UI of my project.
When list the webhooks using the API, I do get the created webhook. Is this behaviour intended?
Thanks.