The 8 is disregarded in the following multiplicands:
12345679 x 9 = 111,111,111
12345679 x 18 = 222,222,222
12345679 x 27 = 333,333,333
12345679 x 36 = 444,444,444
12345679 x 45 = 555,555,555
12345679 x 54 = 666,666,666
12345679 x 63 = 777,777,777
12345679 x 72 = 888,888,888
12345679 x 81 = 999,999,999
And that is why the 8 revenged itself on the 1 ignoring it in a step-like product:
12345679 x 8 = 98,765,432
By the way, in this way you can check if your calculator calculates properly