`@par` not processed correctly when front matter is absent

[akrzemi1]

Given the following comment

/**
    
    @par Effects 
    Initializes storage value with expression `MP::marked_value()`.
    
    @post `has_value()` is `false`.
  */
  AK_TOOLKIT_CONSTEXPR markable() AK_TOOLKIT_NOEXCEPT_AS(MP::marked_value())
    : _storage(MP::store_representation(MP::marked_value())) {}

MrDocs renders the following Asciidoc output

Note that the text following @par is displayed on top.

This does no longer happen, when I put some text before @par:

/**
    
    Default constructor.
    
    @par Effects 
    Initializes storage value with expression `MP::marked_value()`.
    
    @post `has_value()` is `false`.
  */
  AK_TOOLKIT_CONSTEXPR markable() AK_TOOLKIT_NOEXCEPT_AS(MP::marked_value())
    : _storage(MP::store_representation(MP::marked_value())) {}

In that case, I get the intuitive output: