diff --git a/packages/sirius-web/backend/sirius-web-application/src/main/java/org/eclipse/sirius/web/application/semanticdata/listeners/SemanticDataInitializer.java b/packages/sirius-web/backend/sirius-web-application/src/main/java/org/eclipse/sirius/web/application/semanticdata/listeners/SemanticDataInitializer.java
index f298f45db3..22b4e519bf 100644
--- a/packages/sirius-web/backend/sirius-web-application/src/main/java/org/eclipse/sirius/web/application/semanticdata/listeners/SemanticDataInitializer.java
+++ b/packages/sirius-web/backend/sirius-web-application/src/main/java/org/eclipse/sirius/web/application/semanticdata/listeners/SemanticDataInitializer.java
@@ -18,6 +18,7 @@
 import org.eclipse.sirius.web.domain.boundedcontexts.semanticdata.services.api.ISemanticDataCreationService;
 import org.springframework.data.jdbc.core.mapping.AggregateReference;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Propagation;
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.transaction.event.TransactionalEventListener;
 
@@ -35,7 +36,7 @@ public SemanticDataInitializer(ISemanticDataCreationService semanticDataCreation
         this.semanticDataCreationService = Objects.requireNonNull(semanticDataCreationService);
     }
 
-    @Transactional
+    @Transactional(propagation = Propagation.REQUIRES_NEW)
     @TransactionalEventListener
     public void onProjectCreatedEvent(ProjectCreatedEvent event) {
         this.semanticDataCreationService.initialize(AggregateReference.to(event.project().getId()));
diff --git a/packages/sirius-web/backend/sirius-web/src/test/java/org/eclipse/sirius/web/application/controllers/ProjectControllerIntegrationTests.java b/packages/sirius-web/backend/sirius-web/src/test/java/org/eclipse/sirius/web/application/controllers/ProjectControllerIntegrationTests.java
index 1954138e4a..d81bed211c 100644
--- a/packages/sirius-web/backend/sirius-web/src/test/java/org/eclipse/sirius/web/application/controllers/ProjectControllerIntegrationTests.java
+++ b/packages/sirius-web/backend/sirius-web/src/test/java/org/eclipse/sirius/web/application/controllers/ProjectControllerIntegrationTests.java
@@ -226,7 +226,7 @@ public void givenValidProjectToCreateWhenMutationIsPerformedThenProjectIsCreated
         assertThat(optionalProject).isPresent();
         optionalProject.ifPresent(project -> assertThat(project.getName()).isEqualTo(input.name()));
 
-        assertThat(this.domainEventCollector.getDomainEvents()).hasSize(1);
+        assertThat(this.domainEventCollector.getDomainEvents()).hasSize(2);
         var event = this.domainEventCollector.getDomainEvents().get(0);
         assertThat(event).isInstanceOf(ProjectCreatedEvent.class);
     }
@@ -241,7 +241,7 @@ public void givenValidProjectToCreateWhenMutationIsPerformedThenTheSemanticDataA
         TestTransaction.flagForCommit();
         TestTransaction.end();
 
-        assertThat(this.domainEventCollector.getDomainEvents()).hasSize(1);
+        assertThat(this.domainEventCollector.getDomainEvents()).hasSize(2);
         var event = this.domainEventCollector.getDomainEvents().get(0);
         assertThat(event).isInstanceOf(ProjectCreatedEvent.class);