Wrong audio channel mapping when exporting to Final Cut Pro XML

[Giovanni5F88]

How to reproduce it:

1. Load the attached 5.1 wav file in Premiere, by default it should look like this on the timeline:
   
2. Change the audio channel mapping of the project item and, for example, swap the L and R channels, like so:
   
3. Export the project to Final Cut Pro XML;
4. Import the Final Cut Pro XML project back into the current one. The channel mapping is wrong:
   

Is this a known limitation of the XML exporter? 

[Giovanni5F88]

Can't attach audio files, you can download it from here: https://www.dropbox.com/s/21a4qplonjpx8oj/5.1.wav?dl=0