I am not sure.. both requests have "debug=true" in them, which in my experience doesn't get tracked... I don't know what the lrt parameter is...
But IF both are requests are showing in your Cloud Debugger (and you aren't using multiple tools in conjunction that might be causing the duplication) I am not sure why both calls are showing for you...
For the record, the old "Cloud Debugger" when you looked at the network calls, you would see "two calls". One registered as a redirect, and the second had "debug=true" in it.. the Cloud debugger would only show ONE of the calls. The redirect was a product of how the Cloud Debugger essentially injected itself in the middle to read and display the request information.
However, there could be other tools that use a similar trick... and the tools aren't designed to understand other "man in the middle inspectors" in use... what you are seeing could simply be a result of multiple tools fighting each other.