if the master node config changes, executors might have to recalibrate

core/src/main/java/jenkins/model/Jenkins.java

@@ -2780,6 +2780,8 @@ public class Jenkins extends AbstractCIBase implements ModifiableTopLevelItemGro
             bc.commit();
         }
 
+        updateComputerList();
+
         rsp.sendRedirect(req.getContextPath()+'/'+toComputer().getUrl());  // back to the computer page
     }