h1 title disappears in the first page

My slides.md looks like this: ``` --- theme: frankfurt infoLine: true # on by default, can be turned off author: 'noname' # shows in infoLine title: 'notitle' # shows in infoLine date: '2024/05/09' # shows in infoLine, defaults to the current date --- # title ``` However, when I open it in slidev, I see only a big blue bar across the first page without any words on it. Is this a bug?