Apart to what I have said previously, here are other public figures get caught to have dual nationalities based on professor google:
- MN a former minister of state enterprises, was found to have dual citizenship with Singapore in 2013. He was stripped of his Indonesian citizenship and banned from holding public office for 5 years.
- RF a former mayor of Padang, was found to have dual citizenship with the United States in 2018.
- EW a former governor of West Kalimantan, was found to have dual citizenship with Malaysia in 2019.
None of them were sentenced to jail as they have not broken any law. All they need if they get caught is to officially renounce one of their nationality. Alternatively If they do not the Immigration will start the process of revoking their Indonesian nationality. But for overstaying over six months I remember reading a case where someone got a jail sentence.
It is widely known that some of Indonesian billionaires have dual nationalities, mainly Australian. Keep in mind to get an Australian permanent residency for instance all they need is to stay for two years under Business and Investment visas. After four years of permanent residency in Australia they could become an Australian citizen.
Again keep in mind the information above might not be accurate. So for those who has got another passport and want to keep his indonesian passport, do that with your own peril.