dbeaver doesn't currently seem to support the MS SQL GO keyword. I'm going to look into adding support for it.
I think I've located the area where query delimiters are gathered, plugins/org.jkiss.dbeaver.model/src/org/jkiss/dbeaver/model/sql/SQLSyntaxManager.java:115
Having a hard time getting the build working on Linux, I'll see how much progress I can make on it.