Operation Document.Update does not return the updated changeToken

When using the operation Document.Update with the parameter changeToken, the returned document still has the same value for changeToken as the one before the update.
From what I have understood, it's because of the CoreSession.save() done in the OperationContext.close() that occurs after returning the updated document in the operation.
Our use case was the following:

• We have a dashboard with a list of documents, for each of them we can update a metadata and we used the operation for that
• Because we don't want to refresh the page provider after each update, we simply update the changeToken for the updated items
• As it was the same value returned, multiple updates of the same item without a refresh of the page lead to a 409 error

Our workaround was to use the CRUD endpoint instead of the Operation.