Not allowed to resolve a type with an XML tag, until it fully closed

1. Given the following code, Ctrl+. at $

        /// <summary>
        ///     Returns a value indicating whether the current project has the specified capability
        /// </summary>
        /// <exception cref="ArgumentNullException$"
        bool Contains(string capability);

Expected: To be be offered to add "using System" to resolve ArgumentNullException Actual: Not offered

Need to completely close the XML tag before I'm allowed to resolve:

        /// <summary>
        ///     Returns a value indicating whether the current project has the specified capability
        /// </summary>
        /// <exception cref="ArgumentNullException"></exception>
        bool Contains(string capability);

This is a bit annoying, because completion doesn't close it for when you choose <exception from completion window.