ReDim of a variable of a custom type

I wrote some example code:

REM  *****  BASIC  *****

Option Compatible
Option Explicit

Type MyType
	a As Integer
	b As Integer
End Type
Dim x(1) As MyType

Sub Main
	Dim y As MyType
	Dim i As Integer
	For i=0 To 1
		x(i).a=1+i*2
		x(i).b=2+i*2
	Next i
	y.a=5
	y.b=6

	MsgBox x(0).a & x(0).b & x(1).a & x(1).b & y.a & y.b ' Displays 123456
	
	ReDim x(1) As MyType
	ReDim y As MyType
	MsgBox x(0).a & x(0).b & x(1).a & x(1).b & y.a & y.b ' Displays 123400
End Sub

So if we have an array as MyType (or any other custom type, I
suppose), ReDim will not reset it.
Is this the expected behaviour or should I write a bug report?
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