Monday CRM changed the uploaded_by field on the Asset object in API version 2027-04. The field now returns User instead of User!, so it can be null. A null value means the uploader can't be resolved.
This is a breaking change. Clients that expect a non-null type, including code generated from the schema, can fail. Code that reads uploaded_by.id or uploaded_by.name without a check will also break.
Developers should check for null before reading uploaded_by's fields. They should also regenerate schema-derived types for 2027-04.