IOTL they usually do. The thing is, Portugal ITTL has little to offer as it is now broke. It can probably offer military protection for the Atlantic territories but East Timor is probably beyond its reach now.
If any African countries tried to take action, the Portuguese probably wouldn't think it worth it to get dragged into yet another war, let alone one over "useless" colonies. But if no countries have the capability, I can see everyone being too blasé to put up a stink. Likewise re: E Timor.