I installed it on my 2019-2020 and it id not fix the problem. There is still 1 employee showing RESC and they shouldn't. I have run a super report for the whole year and confirmed that did not have any RESC for the last financial year.
That's annoying Kylie, I've run a few payrolls in the 19/20 year, and the employees that were effected before I ran that 18/19 patch, are still ok in this FY. I hope you get it sorted, and the issue doesn't reappear for me!