QuickShape within ListView not showing when using CurveRenderer

During refactoring of the wearable example, we use Shape elements to create ListItems with diagonal gradients in their header: https://codereview.qt-project.org/c/qt/qtdeclarative/+/522435

Sometimes the header is not shown (see appended screenshots).

It works with Geometric Renderer.

The following warning, created by the intersection solver is shown on the command line: "No suitable start found. This should not happen. Returning the path unchanged." The reason is that the intersection solver gets an empty path.