UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

Steps to reproduce the problem:
My issue is unique and I can see it. My repro steps is what I think I did
1. Get an object with data from web server
2. issue: copy(data) where data is the new of the object.
3. make a change where a property is not returned at all from the web server
4. do another copy(data)

What is the expected behavior?
The structure copied in the clipboard should be the same as the structure of the object in memory

What went wrong?
I copied the data structure from the second copy into a text file and compare it to the data structure using the watch tab or the console and I noticed that the structure in the text file still had the property that wasn't returned anymore from the web server. I used Fiddler and confirmed that the property is not there. That property still exists when I did a copy(data)

Did this work before? N/A 

Chrome version: 66.0.3359.139  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: