Have Been Some Recent Changes Regarding Controller/action Names Changes Regarding Lowercase

I am wondering if were some framework changes that affect that all controller and action names are treated and searched exclusively in lowercase.

We facing some recent unexplained behaviour that our links that are /api/v1/GetAction, the action that is searched is actually "getaction"

Do you know what goes on?

I found out that this was because we had for urlManager

caseSensitive = true