Fix Predicate issue in v2.9.0 (#10321)

Author: sydney-runkle

Diff for: pydantic/_internal/_known_annotated_metadata.py

@@ -319,6 +319,8 @@ def val_func(v: Any) -> Any:
                             f'Not of {predicate_name} failed',  # type: ignore  # noqa: B023
                         )
 
+                return v
+
             schema = cs.no_info_after_validator_function(val_func, schema)
         else:
             # ignore any other unknown metadata

Diff for: tests/test_annotated.py

@@ -385,6 +385,12 @@ def test_validate_float_inf_nan_python() -> None:
     ]
 
 
+def test_predicate_success_python() -> None:
+    ta = TypeAdapter(Annotated[int, Predicate(lambda x: x > 0)])
+
+    assert ta.validate_python(1) == 1
+
+
 def test_predicate_error_python() -> None:
     ta = TypeAdapter(Annotated[int, Predicate(lambda x: x > 0)])