diff --git a/tests/test_attributes.py b/tests/test_attributes.py
index b4ba2d77a7..40b31fa7f1 100644
--- a/tests/test_attributes.py
+++ b/tests/test_attributes.py
@@ -117,3 +117,41 @@ def test_remove_attribute(sentry_init, capture_envelopes):
     (metric,) = metrics
 
     assert "some.attribute" not in metric["attributes"]
+
+
+def test_scope_attributes_preserialized(sentry_init, capture_envelopes):
+    def before_send_metric(metric, _):
+        # Scope attrs show up serialized in before_send
+        assert isinstance(metric["attributes"]["instance"], str)
+        assert isinstance(metric["attributes"]["dictionary"], str)
+
+        return metric
+
+    sentry_init(before_send_metric=before_send_metric)
+
+    envelopes = capture_envelopes()
+
+    class Cat:
+        pass
+
+    instance = Cat()
+    dictionary = {"color": "tortoiseshell"}
+
+    with sentry_sdk.new_scope() as scope:
+        scope.set_attribute("instance", instance)
+        scope.set_attribute("dictionary", dictionary)
+
+        # Scope attrs are stored preserialized
+        assert isinstance(scope._attributes["instance"], str)
+        assert isinstance(scope._attributes["dictionary"], str)
+
+        sentry_sdk.metrics.count("test", 1)
+
+    sentry_sdk.get_client().flush()
+
+    metrics = envelopes_to_metrics(envelopes)
+    (metric,) = metrics
+
+    # Attrs originally from the scope are serialized when sent
+    assert isinstance(metric["attributes"]["instance"], str)
+    assert isinstance(metric["attributes"]["dictionary"], str)
diff --git a/tests/test_logs.py b/tests/test_logs.py
index 3b60651631..f2ddab7888 100644
--- a/tests/test_logs.py
+++ b/tests/test_logs.py
@@ -597,3 +597,40 @@ def test_log_attributes_override_scope_attributes(sentry_init, capture_envelopes
 
     assert log["attributes"]["durable.attribute"] == "value1"
     assert log["attributes"]["temp.attribute"] == "value2"
+
+
+@minimum_python_37
+def test_attributes_preserialized_in_before_send(sentry_init, capture_envelopes):
+    """We don't surface references to objects in attributes."""
+
+    def before_send_log(log, _):
+        assert isinstance(log["attributes"]["instance"], str)
+        assert isinstance(log["attributes"]["dictionary"], str)
+
+        return log
+
+    sentry_init(enable_logs=True, before_send_log=before_send_log)
+
+    envelopes = capture_envelopes()
+
+    class Cat:
+        pass
+
+    instance = Cat()
+    dictionary = {"color": "tortoiseshell"}
+
+    sentry_sdk.logger.warning(
+        "Hello world!",
+        attributes={
+            "instance": instance,
+            "dictionary": dictionary,
+        },
+    )
+
+    get_client().flush()
+
+    logs = envelopes_to_logs(envelopes)
+    (log,) = logs
+
+    assert isinstance(log["attributes"]["instance"], str)
+    assert isinstance(log["attributes"]["dictionary"], str)
diff --git a/tests/test_metrics.py b/tests/test_metrics.py
index 240ed18a37..d64ce748e4 100644
--- a/tests/test_metrics.py
+++ b/tests/test_metrics.py
@@ -335,3 +335,40 @@ def test_metric_attributes_override_scope_attributes(sentry_init, capture_envelo
 
     assert metric["attributes"]["durable.attribute"] == "value1"
     assert metric["attributes"]["temp.attribute"] == "value2"
+
+
+def test_attributes_preserialized_in_before_send(sentry_init, capture_envelopes):
+    """We don't surface references to objects in attributes."""
+
+    def before_send_metric(metric, _):
+        assert isinstance(metric["attributes"]["instance"], str)
+        assert isinstance(metric["attributes"]["dictionary"], str)
+
+        return metric
+
+    sentry_init(before_send_metric=before_send_metric)
+
+    envelopes = capture_envelopes()
+
+    class Cat:
+        pass
+
+    instance = Cat()
+    dictionary = {"color": "tortoiseshell"}
+
+    sentry_sdk.metrics.count(
+        "test.counter",
+        1,
+        attributes={
+            "instance": instance,
+            "dictionary": dictionary,
+        },
+    )
+
+    get_client().flush()
+
+    metrics = envelopes_to_metrics(envelopes)
+    (metric,) = metrics
+
+    assert isinstance(metric["attributes"]["instance"], str)
+    assert isinstance(metric["attributes"]["dictionary"], str)