The revised temporary rules require that exposed, vaccinated but asymptomatic workers stay home for 14 days even if they test negative or, if they return to work, to wear masks and stay 6 feet (1.8 meters) from others for two weeks.
https://www.kcra.com/article/new-california-rules-end-distinction-for-vaccinated-workers/38540901
https://www.kcra.com/article/new-california-rules-end-distinction-for-vaccinated-workers/38540901