Clicking on one of the anchor icons (top in my case) crashes the program with what seems to be a null pointer access.

I have attached the project, the item in question is
root\shaderDelegate\Rectangle\Rectangle
Select that in the navigator, then in the properties editor click the first anchor button in the layout tab.

I also built it myself in Qt Creator and tried to debug it, I have attached a full back-trace as generated by the installed version.