Intellij Display Kotlin File

In Intellij, each of the Kotlin types has it's own icon (Object, Class, Interface, File).

For all types but 'File' the Kotlin extension '.kt' is blended out. 

For the 'File' type, the '.kt' extension is not blended out which I find very distracting ;).

I am not sure if this is intended as a 'feature' or is a bug.  Personally I find this extra .kt extension very distracting in the otherwise clean list of class/interface names.