The problem is that there is a direct formatting of the text content and not of the cell. Perform a CTRL+M (removing any direct formatting) on cell B2 before you use clone formatting and everything works as designed. To avoid to require a subsequent removal of direct formatting, insert any text using Edit -> Paste Special -> Paste Special -> Selection: Unformatted Text
The problem is that there is a direct formatting of the text content and not of the cell. Perform a CTRL+M (removing any direct formatting) on cell B2 before you use clone formatting and everything works as designed. To avoid to require a subsequent removal of direct formatting, insert any text using Edit -> Paste Special -> Paste Special -> Selection: Unformatted Text