Using reflection to get method name inside an async method does not return expected result

Following is a tiny snippet of code I wrote to demonstrate the basics of this problem.

Code

private async void Form1_Load( object sender, EventArgs e ) {
    var result = await TestAsyncMethodName();
}

private async Task<string> TestAsyncMethodName() {
    string name = "Method: " + System.Reflection.MethodBase.GetCurrentMethod().Name;

    int x = 0;
    foreach ( StackFrame sf in (new StackTrace()).GetFrames()) {
        x++;
        name = name + "\nStack Frame [" + x + "] : " + sf.GetMethod().Name;
    }

    await Task.Run( () => { name = name + "\nAnonymous Method: " + System.Reflection.MethodBase.GetCurrentMethod().Name; } );

    return name;
}

Result

Method: MoveNext
Stack Frame [1] : MoveNext
Stack Frame [2] : Start
Stack Frame [3] : TestAsyncMethodName
Stack Frame [4] : MoveNext
Stack Frame [5] : Start
Stack Frame [6] : Form1_Load
Stack Frame [7] : OnLoad
Stack Frame [8] : OnCreateControl
Stack Frame [9] : CreateControl
Stack Frame [10] : CreateControl
Stack Frame [11] : WmShowWindow
Stack Frame [12] : WndProc
Stack Frame [13] : WndProc
Stack Frame [14] : WmShowWindow
Stack Frame [15] : WndProc
Stack Frame [16] : OnMessage
Stack Frame [17] : WndProc
Stack Frame [18] : DebuggableCallback
Stack Frame [19] : ShowWindow
Stack Frame [20] : SetVisibleCore
Stack Frame [21] : SetVisibleCore
Stack Frame [22] : set_Visible
Stack Frame [23] : RunMessageLoopInner
Stack Frame [24] : RunMessageLoop
Stack Frame [25] : Run
Stack Frame [26] : Main
Stack Frame [27] : _nExecuteAssembly
Stack Frame [28] : ExecuteAssembly
Stack Frame [29] : RunUsersAssembly
Stack Frame [30] : ThreadStart_Context
Stack Frame [31] : RunInternal
Stack Frame [32] : Run
Stack Frame [33] : Run
Stack Frame [34] : ThreadStart
Anonymous Method: <TestAsyncMethodName>b__0

Expected Result

Method: TestAsyncMethodName
Stack Frame [1] : MoveNext
Stack Frame [2] : Start
Stack Frame [3] : TestAsyncMethodName
Stack Frame [4] : MoveNext
Stack Frame [5] : Start
Stack Frame [6] : Form1_Load
Stack Frame [7] : OnLoad
Stack Frame [8] : OnCreateControl
Stack Frame [9] : CreateControl
Stack Frame [10] : CreateControl
Stack Frame [11] : WmShowWindow
Stack Frame [12] : WndProc
Stack Frame [13] : WndProc
Stack Frame [14] : WmShowWindow
Stack Frame [15] : WndProc
Stack Frame [16] : OnMessage
Stack Frame [17] : WndProc
Stack Frame [18] : DebuggableCallback
Stack Frame [19] : ShowWindow
Stack Frame [20] : SetVisibleCore
Stack Frame [21] : SetVisibleCore
Stack Frame [22] : set_Visible
Stack Frame [23] : RunMessageLoopInner
Stack Frame [24] : RunMessageLoop
Stack Frame [25] : Run
Stack Frame [26] : Main
Stack Frame [27] : _nExecuteAssembly
Stack Frame [28] : ExecuteAssembly
Stack Frame [29] : RunUsersAssembly
Stack Frame [30] : ThreadStart_Context
Stack Frame [31] : RunInternal
Stack Frame [32] : Run
Stack Frame [33] : Run
Stack Frame [34] : ThreadStart
Anonymous Method: <TestAsyncMethodName>b__0

References (Research done):

StackOverflow

• Get Method name that threw exception
• Can you use reflection to find the name of the currently executing method?
• How to get the name of the current method from code [duplicate]

Microsoft

• MethodBase.GetCurrentMethod() Method