To quote from the Bannermans Lawyers’ article about this:-
What about damage to my lot property that will result from the owners corporation carrying out
repairs to common property?
If the owners corporation damages your lot property in the course of repairing and maintaining the
common property, it is liable for the damage to your lot property.
It’s not about ownership of the property, it’s about liability. If you damage someone else’s car, you are responsible for its repairs. If the Owners Corporation leak damages your property, like ceiling paint, or carpet, then the OC is liable for its repair.