Reference highlighting does not work for partial constructors

[jhinder]

Version Used: VS 18.0.0 Insiders

Steps to Reproduce:
Place the caret on the names of the class members (C, M, P, E) in turn.

partial class C
{
    partial C();
    partial C()
    {
    }

    partial void M();
    partial void M()
    {
    }

    partial int P { get; set; }
    partial int P { get { return 0; } set { } }


    partial event EventHandler E;
    partial event EventHandler E { add { } remove { } }
}

Expected Behavior:
Reference highlighting works for all members.

Actual Behavior:
Reference highlighting does not work on the constructor, but on all other members.