Version Used:
codeanalysis 3.5.0

Steps to Reproduce:

On a Visual Basic

1. Call Reduce on a single variable field with an As clause and an initializer

<Workspace>
    <Project Language="Visual Basic" CommonReferences="true">
        <Document>
            Imports System
            Imports I = System.Int32
            Module Program
                Public Dim {|SimplifyParent:x As Integer = 5|}
            End Module
        </Document>
    </Project>
</Workspace>

Expected Behavior:
Same output as input

Actual Behavior:
As clause gets removed.
If option strict is on: Removing the as clause causes a compile error
If option strict is off: It changes the inferred type of the field to be Object in all cases

Other details:
This shot up my priority list when I realized the option to workaround this bug had been removed, though I'd much prefer we fix this bug than bring the option back.