No, this is a bug, but a fixable one. Apply a Chord Symbol Region to the region you want to hide. This obviously will show chord symbols where you don’t want them. Now that the symbols are showing, select all of them, and in the Properties panel select Chord Symbols/Hidden. This will hide the symbols, but the staff is still showing due to the Chord Symbol Region. Delete the Chord Symbol Region and the staff will correctly be hidden where you want it.