https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96489
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> --- See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1185r2.html Your understanding of <=> is from 2018, that's not how C++20 works.
