I can well believe that Kids cope well in structure and routine, its stressful for them to leave the usual whether that be home or school. Some kids cope well in adversity other kids cope differently and need different support.
The other thing is the subliminal anxiety and stressful changes kids are exposed to. Kids have no filter and you can imagine some of the stories in schools around Covid, kids arent naturally allowed interact, separated at play , distance, washing your hands etc.
It all leads to subliminal insecurity and anxiety for some kids. Home is safe, you can understand that. For kids in my opinion there are so many stresses both obvious and subliminal around at the moment, that makes more sensitive or emotionally intelligent kids very stressful and anxious. Its all new in terms of their ongoing development, they are going through something now at a formative stage none of us have had to encounter growing up.
Holloween being cancelled and narrative soon around being Xmas being canceled wont help.