Creator 2.6.0-beta fails to import C++ code styles it generated itself

Steps to reproduce

1. Pathway 1
   1. Delete everything in C:\Users\ [username]\AppData\Roaming\Nokia\qtcreator\codestyles\Cpp
   2. Open Creator 2.6.0-beta
   3. Copy the "Qt [built-in]" style, give it any name, edit it
   4. Restart Qt Creator
   5. Try to import C:\Users\ [username]\AppData\Roaming\Nokia\qtcreator\codestyles\Cpp\qt2.xml
2. Pathway 2
   1. Copy an XML code-style file from Qt Creator 2.5.2 into C:\Users\ [username]\AppData\Roaming\Nokia\qtcreator\codestyles\Cpp
   2. Open Qt Creator 2.6.0-beta
   3. Export the style from #2.1 into C:\tmp
   4. Try to import C:\tmp\ [filename].xml

Results
Step #1.4: My edited style is no longer available in the Code style menu
Step #2.2: My old style is available in the Code style menu

End of both pathways: Error message, "Cannot import code style from %1"

Other observations

• The XML format from Creator 2.6.0-beta is different from Creator 2.5.2
• Unlike the files from Creator 2.5.2, "qt2.xml" does not contain the DisplayName variable (i.e. the style name is not saved)
• The effects of this bug are similar to QTCREATORBUG-6952 but it probably has a different root cause