MSB 2 Samuel Introduction

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When viewing a passage in 2 Samuel, if I look at the MacArthur Study Bible sidebar giving commentary for that passage and click on "Introduction to 2 Samuel" at the top of the sidebar, it only goes to the introduction for 1 Samuel (though the URL says 1-2 Samuel).

Not sure if this is the case in the other 2nd books of the Bible - haven't tested it out.