diff --git a/lib/galaxy/model/__init__.py b/lib/galaxy/model/__init__.py
index fd75e87931eb..32550f11fd93 100644
--- a/lib/galaxy/model/__init__.py
+++ b/lib/galaxy/model/__init__.py
@@ -2999,7 +2999,7 @@ class History(Base, HasTags, Dictifiable, UsesAnnotations, HasName, Serializable
     galaxy_sessions = relationship("GalaxySessionToHistoryAssociation", back_populates="history")
     workflow_invocations = relationship("WorkflowInvocation", back_populates="history", cascade_backrefs=False)
     user = relationship("User", back_populates="histories")
-    jobs = relationship("Job", back_populates="history")
+    jobs = relationship("Job", back_populates="history", cascade_backrefs=False)
 
     update_time = column_property(
         select(func.max(HistoryAudit.update_time)).where(HistoryAudit.history_id == id).scalar_subquery(),
diff --git a/test/integration/test_job_files.py b/test/integration/test_job_files.py
index f45cd6a722e1..f9f6cfaae540 100644
--- a/test/integration/test_job_files.py
+++ b/test/integration/test_job_files.py
@@ -20,6 +20,7 @@
 
 import requests
 from sqlalchemy import select
+from sqlalchemy.orm import object_session
 
 from galaxy import model
 from galaxy.model.base import transaction
@@ -138,6 +139,8 @@ def create_static_job_with_state(self, state):
             sa_session.commit()
         job = model.Job()
         job.history = history
+        # Safeguard: job was implicitly merged into this Session prior to SQLAlchemy 2.0.
+        object_session(history).add(job)
         job.user = user
         job.handler = "unknown-handler"
         job.state = state