Changing property values of Studio Components does not work for all properties

Regression to 4.7.1

Steps to reproduce:

• Create a project
• Add QtQuick Studio Components module
• Add e.g. Star component to 2D View
• In Properties view, try changing e.g. fill color and stoke color
• -> 2D View does not update to show the new colors, code view does not show these properties or their values for the StarItem
• Save changes
• -> colors are reset to default values in Properties view
• At least fill color, stroke color, stroke width and dash offset have this issue
• Changing some of the porperties (e.g. count, ratio, stroke style, radius) does seem to work correctly