VCS Trigger Rules - Pattern matching not working as expected

Hi,

I have a vcs trigger setup with these rules:

-:comment=[TeamCity]:**/*
+:root=Trunk - Origin Services:**/origin-services/services/src/main/sql/**/*

Someone checked into a file under the pattern and it didn't trigger the build.  I then changed it to "**/origin-services/services/src/main/sql/**/*.sql" and the build triggered.  Is this expected or is there a bug here?

Thanks,
Jay