Display Options are not sorted in the order they were added

Description

1. Create an initialization module (or change DisplayRegistryInitialization in Alloy templates)
2. Add code like this:

        public void Initialize(InitializationEngine context)
        {
            var options = ServiceLocator.Current.GetInstance<DisplayOptions>();
 
            options.Add("full", "100%", "block-100", "", "epi-icon__layout--full");
            options.Add("threequarter", "75%", "block-75", "", "epi-icon__layout--three-quarter");
            options.Add("twothird", "66%", "block-66", "", "epi-icon__layout--two-thirds");
            options.Add("half", "50%", "block-50", "", "epi-icon__layout--half");
            options.Add("onethird", "33%", "block-33", "", "epi-icon__layout--one-third");
            options.Add("onequarter", "25%", "block-25", "", "epi-icon__layout--one-quarter");
 
            AreaRegistration.RegisterAllAreas();
        }

Expected: A display option list in the UI with the options in the order they were added.

100%
75%
66%
50%
33%
25%

Actual:

75%
25%
66%
100%
50%
33%