Closing other file group tabs

so I have a Wavelab project with 8 file groups, I right click on the first file group and I get an option dialog that says “remove other file groups from project” seems pretty straight forward, so I choose that option, but only a few of the file groups close, I repeat the steps and a few more close, and I repeat the steps and finally all but the initial file group closes, so what is up with that?

Even Though the manual says WL removes all file groups, WL removes alternate groups.

If there are 10 groups, to retain group 1, WL deletes group 2,4,6,8 and 10.

thanks Marker for showing some kind of logical behavior but is this a bug that needs to be addressed? clearly its not behaving the way the manual explains it. or add wording to the manual “removes every other group, so rinse and repeat to desired result”