diff --git a/.github/workflows/pr-drools.yml b/.github/workflows/pr-drools.yml
index a58c471dfe9..86c52ca7bf7 100644
--- a/.github/workflows/pr-drools.yml
+++ b/.github/workflows/pr-drools.yml
@@ -60,8 +60,8 @@ jobs:
           maven-version: ${{ matrix.maven-version }}
           cache-key-prefix: ${{ runner.os }}-${{ matrix.java-version }}-maven${{ matrix.maven-version }}
           allow-snapshots: true
-#      - name: Build drools-core
-#        run: mvn -B clean install -Dquickly --file drools-core/pom.xml
+      - name: Build drools-core
+        run: mvn -B clean install -Dquickly --file drools-core/pom.xml
 #      - name: Build drools-compiler
 #        run: mvn -B clean install -Dquickly --file drools-compiler/pom.xml
       - name:  Run loop Linux
diff --git a/drools-core/src/main/java/org/drools/core/phreak/PhreakTimerNode.java b/drools-core/src/main/java/org/drools/core/phreak/PhreakTimerNode.java
index a895bfc6f64..49b48fcdd84 100644
--- a/drools-core/src/main/java/org/drools/core/phreak/PhreakTimerNode.java
+++ b/drools-core/src/main/java/org/drools/core/phreak/PhreakTimerNode.java
@@ -279,12 +279,16 @@ private void scheduleTimer(TimerNode timerNode,
             return;
         }
 
+        log.info("scheduleTimer: trigger.hasNextFireTime() = " + trigger.hasNextFireTime().getTime() + ", timestamp = " + timestamp);
+
         if ( trigger.hasNextFireTime().getTime() <= timestamp ) {
             // first execution is straight away, so void Scheduling
             if ( log.isTraceEnabled() ) {
                 log.trace( "Timer Fire Now {}", leftTuple );
             }
 
+            log.info("  ok, this one fires now");
+
             TupleImpl childLeftTuple = doPropagateChildLeftTuple(sink, trgLeftTuples, stagedLeftTuples, leftTuple );
             if (childLeftTuple.getStagedType() != LeftTuple.NONE) {
                 // Flag the newly created childLeftTuple to avoid a reevaluation in case it gets
@@ -305,6 +309,8 @@ private void scheduleTimer(TimerNode timerNode,
             TimerNodeJob job = new TimerNodeJob();
             TimerNodeJobContext jobCtx = new TimerNodeJobContext( timerNode.getId(), trigger, leftTuple, tm, sink, smem.getPathMemories(), reteEvaluator );
 
+            log.info("  then, schedule the next one");
+
             DefaultJobHandle jobHandle = (DefaultJobHandle) timerService.scheduleJob( job, jobCtx, trigger );
             leftTuple.setContextObject( jobHandle );
 
diff --git a/drools-core/src/main/java/org/drools/core/time/impl/PseudoClockScheduler.java b/drools-core/src/main/java/org/drools/core/time/impl/PseudoClockScheduler.java
index 5be7a8f171f..a06aefc550e 100644
--- a/drools-core/src/main/java/org/drools/core/time/impl/PseudoClockScheduler.java
+++ b/drools-core/src/main/java/org/drools/core/time/impl/PseudoClockScheduler.java
@@ -102,6 +102,7 @@ public JobHandle scheduleJob(Job job, JobContext ctx, Trigger trigger) {
         TimerJobInstance jobInstance = jobFactoryManager.createTimerJobInstance( job, ctx, trigger, jobHandle, this );
         jobHandle.setTimerJobInstance( jobInstance );
         internalSchedule( jobInstance );
+        logger.info("  scheduleJob : jobHandleId = " + jobHandle.getId() + ", fireTime = " + trigger.hasNextFireTime().getTime() );
         return jobHandle;
     }
 
@@ -150,6 +151,9 @@ private synchronized long runCallBacksAndIncreaseTimer( long increase ) {
         TimerJobInstance item = peek();
         long fireTime;
         while (item != null && item.getTrigger().hasNextFireTime() != null && (fireTime = item.getTrigger().hasNextFireTime().getTime()) <= endTime) {
+
+            logger.info("  runCallBacksAndIncreaseTimer : jobHandleId = " + item.getJobHandle().getId() + ", fireTime = " + item.getTrigger().hasNextFireTime().getTime() );
+
             // remove the head
             queue.poll();
 
diff --git a/drools-test-coverage/test-compiler-integration/src/test/java/org/drools/compiler/integrationtests/TimerAndCalendarFireUntilHaltTest.java b/drools-test-coverage/test-compiler-integration/src/test/java/org/drools/compiler/integrationtests/TimerAndCalendarFireUntilHaltTest.java
index 37494cbe71a..832d54ae892 100644
--- a/drools-test-coverage/test-compiler-integration/src/test/java/org/drools/compiler/integrationtests/TimerAndCalendarFireUntilHaltTest.java
+++ b/drools-test-coverage/test-compiler-integration/src/test/java/org/drools/compiler/integrationtests/TimerAndCalendarFireUntilHaltTest.java
@@ -249,10 +249,12 @@ private Callable<Boolean> ruleHasFired(String ruleName, int times) {
     }
 
     private void advanceTimerOneSecond() {
+        LOG.info("  -- advanceTimerOneSecond");
         timeService.advanceTime(1, TimeUnit.SECONDS);
     }
 
     private void activateRule() {
+        LOG.info("  -- insert trigger");
         triggerHandle = ksession.insert("trigger");
     }
 
diff --git a/drools-test-coverage/test-compiler-integration/src/test/resources/logback-test.xml b/drools-test-coverage/test-compiler-integration/src/test/resources/logback-test.xml
index b9013a7bbdd..494ff803987 100644
--- a/drools-test-coverage/test-compiler-integration/src/test/resources/logback-test.xml
+++ b/drools-test-coverage/test-compiler-integration/src/test/resources/logback-test.xml
@@ -36,6 +36,7 @@
 <!--    <logger name="org.drools.ancompiler" level="debug"/>-->
 
     <logger name="org.drools.compiler.integrationtests" level="info"/>
+    <logger name="org.drools.core" level="info"/>
 
     <root level="warn">
         <appender-ref ref="consoleAppender" />