Wrong icons for filetypes if icon theme is changed

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If you change the icon theme and use v208 of kupfer you get sometimes the wrong icon.

This does not happen to me when i use the default icon theme of my desktop environment.

My default is "elementary xfce (dark)" on xubuntu 12.10.

It looks for me that kupfer uses the icon if it don't know which icon to choose. Or does some kind of caching/reusing thats why i did a video.

[Light on Flux (lightonflux)]

In the list the icon is right. This screenshot was made with faenza.

[Light on Flux (lightonflux)]

I made a screenshot with another icon theme with is widly used, its humanity the ubuntu default, but NOT the xubuntu default.

[Light on Flux (lightonflux)]

The mentioned video, i hope it helps: