Fake return value ignores ReturnsWhen parameter/argument

[rbloehm]

The following unit test for Fakes.InputBox.ReturnsWhen fails. Same happens for MsgBox, other Fakes not tested.

'@TestMethod
Public Sub InputBoxFakeReturnsWhenWorks()
    On Error GoTo TestFail
    
    Dim userInput As String
    Fakes.InputBox.ReturnsWhen "prompt", "Dummy1", "dummy1 user input"
    Fakes.InputBox.ReturnsWhen "prompt", "Expected", "expected user input"
    Fakes.InputBox.ReturnsWhen "prompt", "Dummy2", "dummy2 user input"
    
    userInput = InputBox(prompt:="Expected")

    'Assert fails: userInput is "dummy1 user input"
    Assert.AreEqual "expected user input", userInput 

TestExit:
    Exit Sub
TestFail:
    Assert.Fail "Test raised an error: #" & Err.Number & " - " & Err.Description
End Sub

Hardcoding the invocation number for the "Expected" input box makes the test pass:

    Fakes.InputBox.ReturnsWhen "prompt", "Dummy1", "dummy1 user input"
    Fakes.InputBox.ReturnsWhen "prompt", "Expected", "expected user input", 1
    Fakes.InputBox.ReturnsWhen "prompt", "Dummy2", "dummy2 user input"

But hardcoding the others to 1, too, makes it fail and userInput is "dummy1 user input" again:

    Fakes.InputBox.ReturnsWhen "prompt", "Dummy1", "dummy1 user input", 1
    Fakes.InputBox.ReturnsWhen "prompt", "Expected", "expected user input", 1
    Fakes.InputBox.ReturnsWhen "prompt", "Dummy2", "dummy2 user input", 1

Rubberduck version: Version 2.1.2.2738
Operating System: Microsoft Windows NT 10.0.14393.0, x64
Host Product: Microsoft Office 2016 x64
Host Version: 16.0.8431.2131
Host Executable: EXCEL.EXE

[Vogel612]

Probably has the same root cause as #3720