gnome-sudoku bug evidence

initial state

Symbol definition
A:Cell(1,5)
B:Cell(1,7)
C:Cell(2,9)

Case1 and Case6 are wrong.
Last input Number dose not change to red.

Case1
A->B->C

Case2
A->C->B

Case3
B->A->C

Case4
B->C->A

Case5
C->A->B

Case6
C->B->A