Jenkins GitHub plugin requires a user with administration access to manage hooks:

"There is no credentials with admin access to manage hooks on GitHubRepositoryName[host=example.org,username=username,repository=repository]"

Such approach does not match our security guidelines, so we manage all hooks manually (from GitHub UI). Unfortunately, Jenkins still tries to manage webhooks even when we didn't ask to do it. Our servers list is empty:

I searched for any option which will allow disable this behavior but I didn't find anything. This is the configuration of SCM for our projects:

I believe it is a bug because Jenkins shouldn't do stuff, when we don't configure it. If this behavior is expected, then this ticket should be changed to a feature:

Allow disabling managing webhooks when no GitHub server is configured