Currently when viewing my anime list on Simkl, it's impossible at a glance to tell what is what when a season is split up into multiple parts.

I've attached example screenshots below, first of Simkl and then of the same entries on MAL. On Simkl, it's impossible to tell which entry is which part without clicking onto the entry and reading the subtitle.

JoJo no Kimyou na Bouken: Stone Ocean appears to have the parts in the label, but nothing else seems to.