It’s complicated, as you have already seen from Section 50 of the Act.
But Under S50 (6)(a) the strata manager is supposed to give the OC notice three months before the original contract has expired, and (under (b)) one month’s notice if they are in a contract that has already been renewed (I think …).
They can continue in their role for a further three months after it has expired, if approved by the strata committee when the OC hasn’t either renewed the contract or told them that they will not be renewing (provided that doesn’t go past the date of the AGM)
Oh, and the OC has to give the SM a month’s notice that they won’t be renewing if they have already given an extension.
Like I said, it’s complicated – and I may have misinterpreted an unecessarily complicated part of the legislation.