export/ import XML beetween nightly and 1.3

I hope I don't misplaced the topic....
Should it be a issue tracker ?

I have imported a score into the nightly build e430b8d from thursday.
I wanted to see if when we copy and paste from a file to another "nuance" (like p ff ...) were imported. That's ok.
I hoped that exported to XML and reimported to musescore 1.3 the file would have been read.
It is (yes) but all nuance are written as xml taxt such as : dynamix "and dynamic text"

Here is the file