This Bugzilla instance is a read-only archive of historic NetBeans bug reports. To report a bug in NetBeans please follow the project's instructions for reporting issues.
Please look the the sample files attached to the issue 194939, there are no code folds for them in the editor.
GsfFoldManager disables the folds if there is an erorr in the parser result, see my comment http://netbeans.org/bugzilla/show_bug.cgi?id=194939#c13