What is a good way to determine if all fields on a record except one are empty?

I've got a record that I use for making update requests via json/Jackson:

public record UpdateRequest(
    Optional<String> field1,
    Optional<LocalDate> field2,
    Optional<@Max(24) Integer> field3,
    ...
    Optional<String> specialField) {}

I want to prevent updates from happening if the entity is marked as closed, except for specialField. That can always be used to update the entity.

While the entity is closed, I'd want to allow an update request like:

{
  "specialField": "newValue"
}

But prevent one like:

{
  "field1": "newValue"
}

I'm struggling to come up with a good solution for checking whether the update can be applied. This is what I have:

public boolean isUpdateValid(Entity entity, UpdateRequest updateRequest) {
  return !entity.isClosed() 
      || (updateRequest.field1().isEmpty()
          && updateRequest.field2().isEmpty()
          && updateRequest.field3().isEmpty());
}

But this is pretty error-prone, because no one will update isUpdateValid when new fields are added to UpdateRequest. Does anyone have suggestions about better ways to structure this so that it is more maintainable as UpdateRequest changes?

I came up with the following solution that might be a little janky, but should work.

public boolean isUpdateValid(Entity entity, UpdateRequest updateRequest) {
  return !entity.isClosed() || new UpdateRequest(Optional.empty(), Optional.empty(), ..., updateRequest.specialField()).equals(updateRequest);
}

This should work since records have generate an equals method, but won't work if you override it in your record.