Evaluate Criteria Based on Original Record Values in Process Builder (Critical Update)
Where: This change applies to Lightning Experience and Salesforce Classic in Essentials, Professional, Enterprise, Performance, Unlimited, and Developer editions.
How: From Setup, enter Critical Updates in the Quick Find box. Then select Critical Updates. For Evaluate Criteria Based on Original Record Values in Process Builder, click Acknowledge.
If you have a process with the Do you want to execute the actions only when specified changes are made to the record? option selected, or it uses the ISCHANGED() function in your criteria, this update could cause the process to behave differently.