Created attachment 131161 [details] PlasmaExtras.ListItem See the attached screenshot depicting the Digital Clock applet's popup for what happens as a result.
Created attachment 131162 [details] PlasmaCompoents2.ListItem How the old PC2 ListItem looked, for comparison
Or actually, it looks like the problem might be that the background item is overriding it and is always opaque, unlike the PC2 version.
A possibly relevant merge request was started @ https://invent.kde.org/frameworks/plasma-framework/-/merge_requests/80
Git commit c24ebf1d12817adefa28c8735323a68fdc40638b by Jan Blackquill, on behalf of Carson Black. Committed on 30/08/2020 at 23:41. Pushed by cblack into branch 'master'. Fix incorrect default for PlasmaExtras.ListItem This fixes the mismatched default sectionDelegate compared to PlasmaComponents.ListItem, where it was default false and this was default true. M +1 -1 src/declarativeimports/plasmaextracomponents/qml/ListItem.qml https://invent.kde.org/frameworks/plasma-framework/commit/c24ebf1d12817adefa28c8735323a68fdc40638b