Strange Behavior/MethodDictionary/debugging problem

Hi folks,

I've run into a debugging problem, a reproducable snippet (tested under  
3.9) is

((Behavior new)
        setFormat: MethodDictionary format; "break;"
        basicNew: 8) break

The debugger starts up with MethodDictionary(Object)>>break and not, as  
expected, with a break on the ((Behavior new ...) basicNew: 8) instance.

Uncommenting the "break;" reveals that everything's alright until that  
step (the #basicNew: method cannot be debugged).

What could be wrong or, do I miss something.

/Klaus