Proposed resolution:

This wording is relative to N4981.

1. Modify [ostream.formatted.print] as indicated:

   template<class... Args>
     void println(ostream& os, format_string<Args...> fmt, Args&&... args);
   

   -2- Effects: Equivalent to:

   print(os, "{}\n", format(os.getloc(), fmt, std::forward<Args>(args)...));
   

[ostream.formatted.print] specifies that std::print uses the locale imbued in the std::ostream& argument for formatting, by using this equivalence:

vformat(os.getloc(), fmt, args);

(in the vformat_(non)unicode delegation).

However, std::println ignores the std::ostream's locale for its locale-dependent formatting:

print(os, "{}\n", format(fmt, std::forward<Args>(args)...));

This is inconsistent.