Can not set the execution to a "Select Case" line

Elements Mercury
1

Take the following code:

Public Sub new(a As String)
    a = "1" '<- I have a breakpoint here
    Select Case a '<- I want to set the execution to this line, skipping the execution of the previous line
        Case "1": WriteLn("a=1")
        Case Else: WriteLn("")
    End Select
End Sub

This results in:
image

2

Logged as bugs://E25667.

3

bugs://E25667 was closed as fixed.