VB -> C#: error CS8122 when using is null instead of == null

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My actual VB.Net code is a complicated LINQ query that gets error CS8122 on a part that says Where (pd.Record_Type Is Nothing Or pd.Record_Type = "Acreage") and gets converted to where (pd.Record_Type is null | pd.Record_Type == "Acreage") but here is some code that might be easier to reproduce:

VB.Net input code

Dim x As Object = Nothing
Dim expression As System.Linq.Expression(Of Func(Of Boolean)) = Function() x Is Nothing

Erroneous output

object x = null;
System.Linq.Expressions.Expression<Func<bool>> expression = () => x is null; // CS8122

Visual Studio error: CS8122 An expression tree may not contain an 'is' pattern-matching operator.

Expected output (replace "is" with "==")

object x = null;
System.Linq.Expressions.Expression<Func<bool>> expression = () => x == null; // fine

Details

• Product in use: e.g. VS extension
• Version in use: 9.0.2.0