Summary: Whenever the Label component is used in a manner where the height of the text depends on the height of the component (e.g. https://phabricator.kde.org/D27160?id=77684), a binding loop is created because the height of the component depends on the height of the text. Reproducing: https://phabricator.kde.org/D27160?id=77684
I do not believe label has a loop (especially the PC3 one) If a component has a bug, please make a minimal test case and reopen. Otherwise it'll be in client callling code.