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Some debugging helper code and my conclutions of one work day:
debughelper.tgZ:
-test_broken1/2.py 
 one does triggers the bug, the other doesn't)
-rtest.sh 
 executes boths and compares its outputs
-frameobject.c.diff
 applied to Objects/frameobject.c, adds some debug info.
What I found:
1. The CustomException is disappearing from locals()
2. PyFrame_FastToLocals() (from that .c file) is updating the locals, 
and removing that exception from there.
3. In the failing case this code:
 if (deref) {
 assert(PyCell_Check(value));
 value = PyCell_GET(value);
 }
 is returning value==NULL.
Don't know why that happens.
But you could inspect out1.txt/out2.txt made with rtest.sh, and could 
discover something..