I know almost nothing about this, but have heard that some new condominium buildings in Penang have been affected by subsidence, but this has been kept quiet for obvious reasons.
All I want to say is that if you are looking to buy a condominium then this is one matter you should research. Find out also who would be responsible for making good should this happen, and if they would be able to escape financial responsibility by declaring bankruptcy.
Don’t just trust your conveyancing solicitor to do proper due diligence.
With regards to many matters many developers do not live up to their promises, and then many court cases ensue. This is one of the risks of buying a condo.