UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36

Steps to reproduce the problem:
1. load an application with iframe. so the iframe has compress js file with source-maps.
2. open developer tools.
3. open the iframe.
4. close the iframe (the iframe should be removed from the html when closing its window.)
5. open the iframe again.

What is the expected behavior?
the mapped source files should be accessed in the developer tools. i should be able to put break-point in the mapped source files, etc.

What went wrong?
the whole source-mapping is not working anymore. all i can see is the compressed files.

Did this work before? No 

Chrome version: 56.0.2924.87  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Shockwave Flash 24.0 r0

happans only in chrome. in other browsers it works fine.