Two weeks of mandatory masks, but a record 725 new cases: why are Melbourne's COVID-19 numbers so stubbornly high?

Two weeks of mandatory masks, but a record 725 new cases: why are Melbourne's COVID-19 numbers so stubbornly high?
Melburnians have now been wearing mandatory face coverings in public for two weeks. Yet Premier Daniel Andrews yesterday announced another grim milestone in Victoria's second wave of COVID-19 infections: 725 new cases, a record daily tally for any Australian state since the pandemic began.