@kbsali Unfortunately, we did not come up with a reliable solution, just some fixups and workarounds... Our rplanner now works around antimeridian, but it would be better to say "works fragile" rather than "works".
You are right, indeed, this could be corrected.
Windy team could add the extension after 10 days even in the Arome view because in any case it is displayed when you go first in ECMWF and then back to Arome as you showed in your screenshots. It could be easier to propose it immediately in the Arome view, knowing of course that after 48h in any case, this is the forecast from ECMWF that you are seeing. @ivo FYI