This month we got a nice toolchain fix into qt6-tools thanks to Antonio Larrosa and Qt-upstream.
I dropped many usages of (SUSE-specific) %jobs in .spec files for boo#1237231.

Of the toolchain issues, Haskell(ghc) and octave are still among the big ones.
And Qt still has https://bugzilla.opensuse.org/show_bug.cgi?id=1228131 left, affecting several rpms.

And then there is efl / enlightenment https://git.enlightenment.org/enlightenment/efl/issues/41 (somewhat disappointing)
and https://github.com/libpinyin/libpinyin/issues/162 which might actually be in kyotocabinet.
https://github.com/pop-os/cosmic-edit/issues/221 affects all cosmis-related packages.

erlang also has issues. And https://github.com/mono/mono/issues/20172
And nearly all the LISP/Scheme implementations (sbcl, emacs, racket, ecl, clisp, scheme48, chezscheme).

So there many things left where a small fix could make a big difference...