[Python] Numpy- strange behaviour of __setitem__ of array

Say we have an array:

a = np.array([
[11, 12, 13],
[21, 22, 23],
[31, 32, 33],
[41, 42, 43]
])

a[[1, 3], [0, 2]] = 0


So we want to set zeros to 0th and 2nd element at both 1st and 3rd rows. But what we get is:

[[11 12 13]
[ 0 22 23]
[31 32 33]
[41 42 0]]


Why not:

[[11 12 13]
[ 0 22 0]
[31 32 33]
[0 42 0]]


?

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