item-list template doesn't support wrapper_attributes in Olivero or System template

This is tricky because neither system nor olivero have a wrapping element, so there is nowhere to apply the attributes. Just because they don't use the variable, it doesn't mean that other templates can't, e.g. starterkit_theme, claro and umami. Not sure what to suggest for a proposed resolution, adding a wrapper in the system theme could mess up styles in sites that don't have an overridden template and aren't expecting div soup to be added. Do you have any suggestions?

Maybe only conditionally add a wrapper if #wrapper_attributes is specified? If you set #wrapper_attributes, you expect to get a wrapper.