Code Contracts with Interfaces: "Method Invocation skipped. Compiler will generate method invocation because the method is conditional... [...]"

Good evening,

I just started playing with Microsoft.Contracts (latest version) and plugging it on top of a sample interface and right now it looks like this:

namespace iRMA2.Core.Interfaces
{
    using System;
    using System.Collections.Generic;
    using System.ComponentModel.Composition;
    using System.Diagnostics.Contracts;

    /// <summary>
    /// Base Interface declarations for iRMA2 Extensions
    /// </summary>
    [InheritedExport]
    [ContractClass(typeof(IiRMA2ExtensionContract))]
    public interface IiRMA2Extension
    {
        /// <summary>
        /// Gets the name.
        /// </summary>
        /// <value>The name of the Extension.</value>
        string Name { get; }

        /// <summary>
        /// Gets the description.
        /// </summary>
        /// <value>The description.</value>
        string Description { get; }

        /// <summary>
        /// Gets the author of the extension. Please provide complete information to get in touch with author(s) and the corresponding department
        /// </summary>
        /// <value>The author of the extensions.</value>
        string Author { get; }

        /// <summary>
        /// Gets the major version.
        /// </summary>
        /// <value>The major version of the extension.</value>
        int MajorVersion { get; }

        /// <summary>
        /// Gets the minor version.
        /// </summary>
        /// <value>The minor version.</value>
        int MinorVersion { get; }

        /// <summary>
        /// Gets the build number.
        /// </summary>
        /// <value>The build number.</value>
        int BuildNumber { get; }

        /// <summary>
        /// Gets the revision.
        /// </summary>
        /// <value>The revision.</value>
        int Revision { get; }