Chroma key works incorrectly, makes all green

First, thanks for the great application!
I tried to use chroma key filter, but here is what I get as the result:

Instead of transparency and clear background I get some kind of effect that is applied to background track making it green.
Here I saved a sample project: (2.5 MB)
My Shotcut version 17.05.02
Same with Shotcut version 18.01.02
Do I do something wrong?
And yes, I have Linux OpenSuse 42.3 64 bit

I’ve figured it out myself: had to upgrade frei0r from 1.4 to unstable 1.6.1 and now it’s fine :slight_smile: