When you pin a property in the Visual Studio debugger, it becomes the prioritized display item, effectively overriding [DebuggerDisplay]. This behavior lets you focus on specific fields but can indeed hide the custom display you set up with [DebuggerDisplay]
on the sceen i've pinned a Content property that's why Debugger shows it like Content = {....} instead of expected [DebuggerDisplay("RestResponse {ToString()})]