see for example https://demo.matomo.cloud/index.php?module=CoreHome&action=index&idSite=1&period=day&date=yesterday#?idSite=1&period=week&date=2022-11-04&compareSegments%5B%5D=visitConvertedGoalId%3D%3D7&category=Goals_Goals&subcategory=General_Overview

and https://demo.matomo.cloud/index.php?module=CoreHome&action=index&idSite=1&period=day&date=yesterday#?idSite=1&period=week&date=2022-11-04&compareSegments%5B%5D=visitConvertedGoalId%3D%3D7&category=General_Visitors&subcategory=General_Overview

All sparklines don't show any data / only a flat line

I would assume this used to work.