Fix ops bug

Author: Sg312

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/workflow-block/workflow-block.tsx

@@ -631,10 +631,15 @@ export const WorkflowBlock = memo(function WorkflowBlock({
         ? ((credValue as { value?: unknown }).value as string | undefined)
         : (credValue as string | undefined)
     if (prevCredRef.current !== cred) {
+      // Only clear dependent fields when credential changes from one value to another,
+      // not when it's being set for the first time (e.g., during copilot block creation)
+      const hadPreviousCredential = prevCredRef.current !== undefined
       prevCredRef.current = cred
-      const keys = Object.keys(current)
-      const dependentKeys = keys.filter((k) => k !== 'credential')
-      dependentKeys.forEach((k) => collaborativeSetSubblockValue(id, k, ''))
+      if (hadPreviousCredential) {
+        const keys = Object.keys(current)
+        const dependentKeys = keys.filter((k) => k !== 'credential')
+        dependentKeys.forEach((k) => collaborativeSetSubblockValue(id, k, ''))
+      }
     }
   }, [id, collaborativeSetSubblockValue])