In most cases it's not even misunderstanding, it's deliberate ignorance. You can show them it's incorrect, but they won't back down, because they've spent the past year mouthing off about it.
I read the reports every day. Nothing beyond "we are seeing some transmission in schools."
When there have been some cases, one contact tracer will ask the entire cohort to isolate, while another will say they don't need isolate if everyone was wearing masks.
It has been wildly inconsistent. Some schools stopped wearing masks altogether, and there were no repercussions (true story).
Schools outside Metro had very little or nothing of that. It seems there were other factors at play. But I don't imagine any of us will be seeing the data.