Making requests to /beta/education/classes/{id} or /beta/education/classes?$filter=externalId eq '{id}' gives an incomplete response with an error in the body of the response.
{
"@odata.context": "https://graph.microsoft.com/beta/$metadata#education/classes",
"value": [
{
"@odata.id": "https://graph.microsoft.com/v2/11111111111111/directoryObjects/22222222222/Microsoft.DirectoryServices.Group",
"id": "333333333333333333333",
"description": "Математика (ООП) - 11.",
"displayName": "Математика (ООП) - XI. Ж.",
"mailNickname": "Section_5555555555",
"classCode": "15420",
"externalName": "Математика (ООП) - 11. ф ",
"externalId": "555555555555",
"externalSource": "sis",
"externalSourceDetail": "SIS",
"course": {
"courseNumber": "4444",
"description": "Математика (ООП)",
"displayName": "Математика (ООП)",
"externalId": "4444",
"subject": "Математика"
}{
"error": {
"code": "UnknownError",
"message": "Unexpected token. Check response structure with schema",
"innerError": {
"date": "2021-04-14T12:56:25",
"request-id": "357c7c0f-ef1f-4b15-a928-4126cca3dbf1",
"client-request-id": "357c7c0f-ef1f-4b15-a928-4126cca3dbf1"
}
}
}