Proposed resolution:

This wording is relative to N5008.

1. Modify [map.overview] as indicated:

   
   // 23.4.3.2, construct/copy/destroy
   constexpr map() : map(Compare()) { }
   constexpr explicit map(const Compare& comp, const Allocator& = Allocator());
   template<class InputIterator>
     constexpr map(InputIterator first, InputIterator last,
                   const Compare& comp = Compare(), const Allocator& = Allocator());
   template<container-compatible-range <value_type> R>
     constexpr map(from_range_t, R&& rg, const Compare& comp = Compare(),
                   const Allocator& = Allocator());
   constexpr map(const map& x);
   constexpr map(map&& x);
   constexpr explicit map(const Allocator&);
   constexpr map(const map&, const type_identity_t<Allocator>&);
   constexpr map(map&&, const type_identity_t<Allocator>&);
   constexpr map(initializer_list<value_type>, const Compare& = Compare(),
                 const Allocator& = Allocator());
   

The intent of P3372R3 was for all container constructors to be constexpr, but during application of the paper to the working draft it was observed that one `map` constructor was missed.