diff --git a/geojson_pydantic/base.py b/geojson_pydantic/base.py
index 61e79fb..718f297 100644
--- a/geojson_pydantic/base.py
+++ b/geojson_pydantic/base.py
@@ -52,8 +52,10 @@ def validate_bbox(cls, bbox: Optional[BBox]) -> Optional[BBox]:
 
         return bbox
 
+    # This return is untyped due to a workaround until this issue is resolved:
+    # https://github.com/tiangolo/fastapi/discussions/10661
     @model_serializer(when_used="always", mode="wrap")
-    def clean_model(self, serializer: Any, info: SerializationInfo) -> Dict[str, Any]:
+    def clean_model(self, serializer: Any, info: SerializationInfo):  # type: ignore [no-untyped-def]
         """Custom Model serializer to match the GeoJSON specification.
 
         Used to remove fields which are optional but cannot be null values.
diff --git a/tests/test_geometries.py b/tests/test_geometries.py
index e7e2f08..a219dda 100644
--- a/tests/test_geometries.py
+++ b/tests/test_geometries.py
@@ -339,6 +339,25 @@ def test_parse_geometry_obj_point():
     )
 
 
+@pytest.mark.parametrize(
+    "geojson_pydantic_model",
+    (
+        GeometryCollection,
+        LineString,
+        MultiLineString,
+        MultiPoint,
+        MultiPolygon,
+        Point,
+        Polygon,
+    ),
+)
+def test_schema_consistency(geojson_pydantic_model):
+    """Test to check that the schema is the same for validation and serialization"""
+    assert geojson_pydantic_model.model_json_schema(
+        mode="validation"
+    ) == geojson_pydantic_model.model_json_schema(mode="serialization")
+
+
 def test_parse_geometry_obj_multi_point():
     assert parse_geometry_obj(
         {"type": "MultiPoint", "coordinates": [[100.0, 0.0], [101.0, 1.0]]}