diff --git a/application/src/main/java/org/thingsboard/server/service/queue/processing/BurstTbRuleEngineSubmitStrategy.java b/application/src/main/java/org/thingsboard/server/service/queue/processing/BurstTbRuleEngineSubmitStrategy.java
index 5d4696bef6..655d81e16c 100644
--- a/application/src/main/java/org/thingsboard/server/service/queue/processing/BurstTbRuleEngineSubmitStrategy.java
+++ b/application/src/main/java/org/thingsboard/server/service/queue/processing/BurstTbRuleEngineSubmitStrategy.java
@@ -33,6 +33,7 @@ public class BurstTbRuleEngineSubmitStrategy extends AbstractTbRuleEngineSubmitS
     public void submitAttempt(BiConsumer<UUID, TbProtoQueueMsg<TransportProtos.ToRuleEngineMsg>> msgConsumer) {
         if (log.isDebugEnabled()) {
             log.debug("[{}] submitting [{}] messages to rule engine", queueName, orderedMsgList.size());
+            orderedMsgList.forEach((pair)->log.trace("submitted uuid {}, msg {}", pair.uuid, pair.msg));
         }
         orderedMsgList.forEach(pair -> msgConsumer.accept(pair.uuid, pair.msg));
     }
diff --git a/application/src/test/resources/logback-test.xml b/application/src/test/resources/logback-test.xml
index d3301bf660..5aba1d10dd 100644
--- a/application/src/test/resources/logback-test.xml
+++ b/application/src/test/resources/logback-test.xml
@@ -16,6 +16,9 @@
     <logger name="org.cassandraunit" level="INFO"/>
     <logger name="org.eclipse.leshan" level="INFO"/>
 
+    <logger name="org.thingsboard.server.actors.service.ContextAwareActor" level="TRACE"/>
+    <logger name="org.thingsboard.server.service.queue.processing.BurstTbRuleEngineSubmitStrategy" level="TRACE"/>
+    <logger name="org.thingsboard.server.service.queue.TbMsgPackCallback" level="TRACE"/>
 
     <root level="WARN">
         <appender-ref ref="console"/>
diff --git a/common/actor/src/main/java/org/thingsboard/server/actors/TbActorMailbox.java b/common/actor/src/main/java/org/thingsboard/server/actors/TbActorMailbox.java
index 0e89ee1363..7c7800ac34 100644
--- a/common/actor/src/main/java/org/thingsboard/server/actors/TbActorMailbox.java
+++ b/common/actor/src/main/java/org/thingsboard/server/actors/TbActorMailbox.java
@@ -141,6 +141,7 @@ public final class TbActorMailbox implements TbActorCtx {
                     log.debug("[{}] Going to process message: {}", selfId, msg);
                     actor.process(msg);
                 } catch (TbRuleNodeUpdateException updateException) {
+                    log.debug("[{}] INIT_FAILED: {} {}", selfId, msg, updateException);
                     stopReason = TbActorStopReason.INIT_FAILED;
                     destroy();
                 } catch (Throwable t) {
@@ -155,6 +156,12 @@ public final class TbActorMailbox implements TbActorCtx {
                 break;
             }
         }
+        if (noMoreElements && (!normalPriorityMsgs.isEmpty() || !highPriorityMsgs.isEmpty())) {
+            log.error("noMoreElements=true, but mailbox is not empty!");
+        }
+        if (noMoreElements == false && (normalPriorityMsgs.isEmpty() && highPriorityMsgs.isEmpty())) {
+            log.error("noMoreElements=false, but mailbox is empty!");
+        }
         if (noMoreElements) {
             busy.set(FREE);
             dispatcher.getExecutor().execute(() -> tryProcessQueue(false));