Adding field to to SystemTabNames.PageHeader does not populate field value

[elivnjak]

Optimizely Version: 12.13

When adding a tags field to SystemTabNames.PageHeader the field does not load tags assigned to that field. It just loads a blank text field.

Adding tags works fine. But when you publish and the page refreshes, the field is blank again.

[UIHint("Tags")] [Display(Name = "Tags", Description = "Tags associated with this content.", GroupName = SystemTabNames.PageHeader, Order = 10)] public virtual string Tags { get; set; }