> Dired headlines are not file or directory lines.
> They're not acted on by ! or (most) other

> commands.

Unfortunately some commands, like go to start of buffer (or what is the name) put cursor on first line (header) in dired which is a bit annoying since it is useless. In dired it makes more sense to move cursor/point to start of the first line after the header (first file). I have bound a key to move it so and use that key instead of ordinary move to the beginning of a buffer (C-<home > by default I think).