runtime: Why System.Diagnostics.Process.MainWindowTitle returns empty string on Linux?

System.Diagnostics.Process.MainWindowTitle is empty for all processes on Linux, even when the application has root rights. Tested on Ubuntu 19.10 64bit with .NET Core 3.1 console application.

Repro

sudo ./ConsoleApp2

class Program
    {
        static void Main(string[] args)
        {
            var procs = Process.GetProcesses();
            foreach (var proc in procs)
            {
                Console.WriteLine($"Process: {proc.ProcessName}, MainWindowTitle: {(string.IsNullOrEmpty(proc.MainWindowTitle) ? "<EMPTY>" : proc.MainWindowTitle)}");
            }
        }
    }

Result: