Possible Bug when Adding Sparse and Diagonal Matrices

Dear all,
I encountered today that there is a possible bug when adding sparse  
and diagonal matrices. Here is an example
A=5*sparse(eye(2))+sparse([1 2 2],[2 1 2],[-1 1 3]);
B=5*eye(2)+sparse([1 2 2],[2 1 2],[-1 1 3]);
full(A)-full(B) % gives [0 0; 0 0]
full(A-B) % gives [-5 0; 0 0]

Best regards,
Sebastian Schoeps

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