Can't change user on a predefined integration

Once we defined an integration the “publish as” field (Publicar como) in my spanish versión does not accept changes.
So we define an incoming webhook and then want to change the user that will be showing as the publisher but when we “Save” the field returns to the previous value. No change admitted.
We’ve also tried deactivating before doing the change.

Not sure if this is expected behaviour but is rather annoying as we have to recreate the whole webhook to make changes.

  • Version of Rocket.Chat Server: 3.6.1

  • Operating System: Debian10

  • Deployment Method: docker