[ISSUE #7626] Topic perm was mistakenly changed to 4 in dledger mode (#7661)

Signed-off-by: littleboy <2283985296@qq.com>

namesrv/src/main/java/org/apache/rocketmq/namesrv/routeinfo/RouteInfoManager.java

@@ -301,6 +301,7 @@ public class RouteInfoManager {
             registerFirst = registerFirst || (StringUtils.isEmpty(oldAddr));
 
             boolean isMaster = MixAll.MASTER_ID == brokerId;
+
             boolean isPrimeSlave = !isOldVersionBroker && !isMaster
                 && brokerId == Collections.min(brokerAddrsMap.keySet());
 
@@ -339,7 +340,8 @@ public class RouteInfoManager {
                             topicConfigWrapper.getDataVersion(), brokerName,
                             entry.getValue().getTopicName())) {
                             final TopicConfig topicConfig = entry.getValue();
-                            if (isPrimeSlave) {
+                            // In Slave Acting Master mode, Namesrv will regard the surviving Slave with the smallest brokerId as the "agent" Master, and modify the brokerPermission to read-only.
+                            if (isPrimeSlave && brokerData.isEnableActingMaster()) {
                                 // Wipe write perm for prime slave
                                 topicConfig.setPerm(topicConfig.getPerm() & (~PermName.PERM_WRITE));
                             }