Some more information: I perform some investigation, it looks like since 3.5.xxx the method which parse string and splits it up to the sql expressions was changed dramatically, no it parse string word by word and work with composite delimiters(that make up more than 1 word) incorrectly
That's why such a delimiter like "\nGO\n" (which need just to make sure that GO isn't a part of any other keyword will not work as well