Having to explain this out is pretty common or understandable. And I think it's less about the specific example not saying X, and more about new leadership role = same words now mean totally different things, especially if it's your first go at it.

Many think that leadership IQ is something innate, but some aspects definitely either have to be explained, or learned the hard way. That's totally ok though - it means most of us have what it takes to manage if we're willing to learn.