FRR-OSPFv3 crashs with redundant ABR

[suddi]

Hey,

i have a problem with a redundant ABR-Setup in OSPFv3 seen in the picture.
If the traffic flows over the Router 4.1 and i unplug the link with the red cross, the routes are not switched over to router4.2.
If i restart the daemon on Router4.2 or Router5 the SPF-Process works again and find the correct routes.
For OSPFv2 everything is OK in this constellation!
If i configure only one Area for all of the routers, it works perfectly.
Let me know what you need to understand the problem.

Thanks in advance!