Several patterns in the distributable Labrat.s3m seem to not be ordered in the sequence at all, but all the data is there.

You can actually change it yourself, within a tracker. The correct pattern sequence is as follows:

1, 21, 4, 5, 0, 7, 8, 9, 6, 10, 6, 22, 2, 3, 2, 12, 11, 13, 19, 20, 14, 14, 15, 15, 16, 17, 18, 17