STP setup- post first payrun in MYOB

Hi,

Our business just start using MYOB and we processed our first payrun of 22/23 in MYOB. STP was not setup in MYOB before this payrun (as there was 440 errors to fix and we didnt have time to fix them before the payrun)

I understand, normally next payrun an stp file will be generated (as we are now set up) and since these are YTD figures all is fine to submit to the ATO HOWEVER, my issue is that we are a recruitment company and have employees on the last payrun that will not be on this payrun so will the stp file only include employees on THIS payrun or will it include employees from the last payrun too?

Please help ;)