❔ Trouble moving from MVC 5 to Aspnet Core

Sup guys. I'm moving from MVC 5 to Asp Core and I'm having trouble with RedirectToAction. I'm setting the RouteValues to new { Test = "Hello World" }. But when it gets to my ActionFilterAttribute, the ActionExecutingContext.RouteData.Values["Test"] is null. What am I missing?
Looks like nothing has happened here. I will mark this as stale and this post will be archived until there is new activity.