Unable to generate contracts when XSD contains nillable boolean elements in a group

[UserAvailableIsNotAvailable]

To reproduce the error, try to generate contracts from the following XSD:

<?xml version="1.0" encoding="utf-16"?>
<xs:schema xmlns="http://car/1.0"
           attributeFormDefault="unqualified"
           elementFormDefault="qualified"
           targetNamespace="http://car/1.0"
           xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:group name="LimitedEditionType">
    <xs:sequence>
      <xs:element nillable="true" name="IsAvailable" type="xs:boolean" />
    </xs:sequence>
  </xs:group>

  <xs:complexType name="PorscheType">
    <xs:sequence>
      <xs:group ref="LimitedEditionType"/>
      <xs:element name="Model" type="xs:string" />
    </xs:sequence>
  </xs:complexType>

</xs:schema>

Error:

Contract.cs(177,40): error CS0738: 'PorscheType' does not implement interface member 'ILimitedEditionType.IsAvailable'. 'PorscheType.IsAvailable' cannot implement 'ILimitedEditionType.IsAvailable' because it does not have the matching return type of 'bool'.

XSD group generates an interface but does not handle Nullable types:

public partial class PorscheType : ILimitedEditionType
{
    
    [System.Xml.Serialization.XmlElementAttribute("IsAvailable", Namespace="http://car/1.0", IsNullable=true)]
    public System.Nullable<bool> IsAvailable { get; set; }
    
    [System.Xml.Serialization.XmlElementAttribute("Model", Namespace="http://car/1.0")]
    public string Model { get; set; }
}

public partial interface ILimitedEditionType
{
    
    bool IsAvailable
    {
        get;
        set;
    }
}

[mganss]

Fixed in 2.0.732.

[UserAvailableIsNotAvailable]

Hello,

I tested again with 2.0.732.
The problem is still present. The interface is not generated with nullable types:

public partial interface ILimitedEditionType
{
    
    bool IsAvailable
    {
        get;
        set;
    }
}

It should be:

public partial interface ILimitedEditionType
{
    
    System.Nullable<bool> IsAvailable
    {
        get;
        set;
    }
}

Can the issue be reopened?

[mganss]

Have you specified -0 on the command line?

[UserAvailableIsNotAvailable]

I did not. After specifying it it eventually works.
Thanks