I have created a multibranch pipeline project and configured a webhook (for pushed changes) in my Bitbucket Native Server as follows:

https://<JENKINS_URL>/bitbucket-scmsource-hook/notify?server_url=<BITBUCKET_SERVER_URL> 

However, the webhook does not trigger the reindexing of my multibranch project. I have checked the POST message and I have seen that the payload always provides a change like this one:

"changes":[ 
   { 
    "ref":{ 
      "id":"refs/heads/my_test",
      "displayId":"my_test",
      "type":"BRANCH"
    },
    "refId":"refs/heads/my_test",
    "fromHash":"8e1e85228a6a76d6f127772037b921ce97b86434",
    "toHash":"b3696c9321f5a2e478aa9a60e61a7baa43ac9964",
    "type":"ADD"
  }
]

If I manually send the POST request and leave changes empty, then the reindexing is triggered properly:

"changes":[]

Am I doing something wrong with the configuration of the webhook or is this a bug?

Many thanks for help and clarification.