Statistically, there seems more daily local community infections in work pass holders than SCs/SPRs. There seems to be also less SCs than PRs. I am referring to the data gov reports every day (e.g. via whatsup). Interestingly, practically no LTVP and such - there was one case or so within last 1-2 weeks. And probably most frequently (in community), work permit holders outside the dorms. This is pretty interesting pattern taking into account the respective population numbers.
Low No for LTVP (haven't seen any DP) may suggest one of the scenarios: (1) the majority of the mentioned work pass holders are of the type not allowing them to bring over their families, or (2) most if not all the cases come from the quarantine and are work related.
Work Permit holders (outside dorms) are perhaps still linked to the dorms some way.