From a James Ham article (NBC Sports) on July 1 (sorry I can’t seem to be able to grab the link...):
Coach Walton:
“I talked to Jabari about being out in public and kind of reminded him, one, that even though he's been cleared to end his self isolation, we still can’t have anyone who gets sick doing hard physical work until a later date when you’re cleared by doctors,” Walton said.
In addition to the issue of Parker being out playing tennis before he’s been cleared by team doctors, it is also problematic that he wasn’t wearing a mask, following a positive test, while in public.
“Him, as well as everyone on our team has been reminded of the importance of wearing facemasks and being socially responsible, not just for ourselves, but for everyone we come in contact with,” Walton added.