This correction is for the version published in Knitcircus. The knottygnome designs pattern download is correct
There should be one more tuck worked after the last two repeats of the lace pattern and before you knit the stockinette rounds. So after working the lace pattern for the final time, work 6 rnds rev st, then tuck, then Knit 2[2, 6, 6, 6] rounds.
It should be corrected in Knitcircus soon. Sorry for any inconvenience.