Pending workers to employees mid month

I have an issue whereby those that are pending workers at the point of running Payroll Calculate, but get converted to employees after the payroll calculate date, and are subsequently paid in the period, are causing errors on the flow as their calculation cards aren't created until they are an employee. For example payroll is calculated on the 19th, they move to an employee on the 23rd, and are paid for the 23rd to the 30th June. Is there a solution for this? Currently, we leave the payroll calculate flow as late as possible to avoid having so many