Blazor WASM JS Calls with an Object Argument Work in VS Debug But Not a Published Release

I have a Blazor WASM app that uses JSRuntime to Get/Put IndexedDB data (mockup below). Calls to "Put" functions that pass an object (not a native type) to be stored work fine in the VS Community 2022 debugger, but when I run a published version of the app, the JS code for these calls is not being successfully invoked (no console.log output as shown below).

I've read that "complex framework types...might be trimmed away by the IL Trimmer on publish..." but don't really understand that. This is the only thing I've come up with that sounds possibly related to my problem. I'd appreciate some guidance. Thanks.

public class MyClass : ICloneable
    {
    public int MyInt { get; set; }
    public bool MyBool { get; set; }
    public string MyString { get; set; }
    public DateTime MyDateTime { get; set; }
    
    public MyClass()
        {
        MyInt = 1;
        MyBool = false;
        MyString = string.Empty;
        MyDateTime = DateTime.Now;
        }
    
    public object Clone()
        {
        return new MyClass()
            {
            MyInt = MyInt,
            MyBool = MyBool,
            MyString = MyString,
            MyDateTime = MyDateTime,
            };
        } // end Clone
    } // MyClass 
        
MyClass myClass = new MyClass();
await JSRuntime.InvokeAsync<string>("My_Put", myClass);

// Javascript
function My_Put (myClass)
    {
        console.log("(TS) My_Put Start");
        var request = myDatabase.transaction(myStoreName, "readwrite")
            .objectStore(myStoreName)
            .put(myClass);
        request.onsuccess = function (event)
        {
            console.log("(TS) My_Put: SUCCESS");
            return "(TS) SUCCESS";
        }
        request.onerror = function (event)
        {
            console.log("My_Put: ERROR");
            return "(TS) ERROR";
        }
    } // My_Put