System.Net.WebException: The remote server returned an error: (411) Length Required

[TomW-Skyline]

When using this library in a .NET Framework 4.7.2 project, the following exception occurs.
Same code in .NET 8.0 works fine.

Unhandled Exception: JenkinsNET.Exceptions.JenkinsJobBuildException: Failed to build Jenkins Job '...'! ---> System.Net.WebException: The remote server returned an error: (411) Length Required.
at System.Net.HttpWebRequest.GetResponse()
at JenkinsNET.Internal.JenkinsHttpCommand.Run()
at JenkinsNET.JenkinsClientJobs.Build(String jobName)