UGGrid: Wrong geometry for nonconforming intersections

If I refine a cube UG grid locally in an nonconforming way (i.e. ClosureType::NONE), I observed that after some refinements the intersection geometry doesn't seem to work properly in all cases. More specifically, it seems to be larger than the smaller of two edges in some cases, which in my understanding should not happen. In contrast, e.g. ALUGrid doesn't show this behaviour.

I can not tell if the problem is in the wrapper or in UGGrid itself. I'll attach a test case that triggers the problem.dune-uggrid-bug.cc