Update prefix trace parser test contract

runs/frontier-fidelity-envelope-v1/test_fidelity_envelope.py

@@ -150,12 +150,14 @@ class FidelityEnvelopeTest(unittest.TestCase):
                         },
                     ]
                 )
-            parsed = module.parse_trace(f"u0p01={trace}")
+            parsed = module.parse_trace(f"u0p01={trace}", prefix_caching=False)
             self.assertEqual(parsed["requests"], 2)
             self.assertEqual(parsed["shapes"], [(512, 1), (2048, 2)])
             json.dumps(module.trace_manifest_entry(parsed))
             uniform = module.parse_trace(
-                f"r1={trace}", rate_contract="uniform-spacing"
+                f"r1={trace}",
+                rate_contract="uniform-spacing",
+                prefix_caching=False,
             )
             self.assertEqual(uniform["offered_request_rate"], 1.0)