The claim of "participation" in the so called partition is inflammatory. You make it sound like Poland was a party to some kind of an agreement to dissolve Czechoslovakia, when there is no evidence of that, especially in retrospect.
https://en.wikipedia.org/wiki/Polish%E2%80%93Czechoslovak_bo...
I agree that the Czechoslovakian situation was less hopeful than that of Ukraine, at least for the moment.