Owners Corp has a duty to maintain common property under law. If the first repair didn’t fix the problem, they have to move onto the second repair.
Does forthcoming building work include fixing the balcony and brick wall, or is it just the repairs to your apartment that have been left out? If so, it’s reasonable that they are not repairing your apartment until they know the problem is properly fixed.
I think you should involve a lawyer. With mould and fungi, you could be heading towards a situation where you need alternative accommodation. A lawyer can help you understand what is reasonable and how NCAT has treated these situations in the past.