One possible reason for the changes to case routing is the difference in the order of execution between before save flow triggers and workflow rules. Before save flow triggers run before assignment rules, which means that any field updates made by the flow can affect how the assignment rules assign the case. Workflow rules run after assignment rules, which means that any field updates made by the workflow do not affect how the assignment rules assign the case. Therefore, replacing workflow rules with before save flow triggers can change the case routing logic. Reference: https://help.salesforce.com/s/articleView?id=sf.flow_concepts_trigger.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.order_of_execution.htm&type=5