Missing data in $beforeUpdate callback function

All fields must be specified in the $allowedFields class property. And also if they are changed.

I understand that, but i have these fields declared in allowedFields property:

PHP Code:

protected $allowedFields = [
        'foo', 
        'bar',
        'baz',  
        'id',
        'fk_loan_id',
        'another_field',
];