And you answered the reason in the first 3 words "A digital nomad" Please check the official Indonesia Immigration Government website that I have referenced numerous times for the details on what you can and can not do with a 211a visa
Permohonan Visa Republik Indonesia - Bisnis - B211A - Direktorat working and making money in Indonesia is not one of them.
Lots and lots of "digital nomads" and other expats working illegally in Indonesia get deported every year even be for Corona. You need a KITAS and Indonesia Tax ID to work and make money in Indonesia. People working as digital nomads or working under a 211a visa are braking a Indonesia labor laws hence why there deported. This is the same as foreigners working illegally in the USA on a non working visa.
If your not braking the rules clearly listed on the Indonesia Immigration website then you have no reason to "be careful". Its pretty simple when your in a foreign country be follow there rules, be respectful and you will not have any issues or need to worry.