当程序读取二维数组时，指向数组的指针输出不正确的值，但向量输出正确的值

int array[3][3] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
int** ptr = (int**)malloc(sizeof(int*) * 3);

for (int i = 0; i < 3; i++) {
    ptr[i] = array[i];
}

for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++) {
        printf("%d ", ptr[i][j]);
    }
    printf("\n");
}

free(ptr);

int array[3][3] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
int* ptr = (int*)malloc(sizeof(int) * 9);

for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++) {
        ptr[i * 3 + j] = array[i][j];
    }
}

for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++) {
        printf("%d ", ptr[i * 3 + j]);
    }
    printf("\n");
}

free(ptr);