Why don't all of these variables get treated the same way?

I was checking that the position of variable declarations in VB.NET don't matter, except for scope, (for this question) and I thought I better check what happens when they're "lifted" into a closure. I haven't read the spec, but I can't explain these results:

Dim outer As Integer
For i = 1 To 2
 Dim inner As Integer
 Try
  Dim inner2 As Integer
  Do
   Dim inner3 As Integer
   Call Sub()
    Dim inner4 As Integer
    Console.WriteLine(outer & ", " & inner & ", " & inner2 & ", " & inner3 & ", " & inner4)
    outer = i
    inner = i
    inner2 = i
    inner3 = i
    inner4 = i
   End Sub()
  Loop Until True
 Finally
 End Try
Next

The above outputs:

0, 0, 0, 0, 0
1, 1, 0, 1, 0

inner4 being reset each time makes sense, as would all or none of the other innerX, but why only inner2?!