If you contract from Opportunity, the Terminated Date on the original Order Product doesn't get populated. This happens only when you contract from Order.
In order to generate a Contract in Salesforce, you either select the "Contract" checkbox on the Opportunity record or the "Contract" checkbox on the Order record. Find out more about the underlying implications.
Learn with us how to set up CPQ to split quotes automatically into multiple orders in case creating one order per quote doesn't meet the company's business requirements.
Discover how Creating Contract and Renewal Opportunity with Salesforce CPQ can simplify your quoting process for the sales team, ensuring at the same time more accurate forecasting.