diff --git a/multichain-testing/ava.fusdc.config.js b/multichain-testing/ava.fusdc.config.js
index 4bee357fbbe..0a749c5b31a 100644
--- a/multichain-testing/ava.fusdc.config.js
+++ b/multichain-testing/ava.fusdc.config.js
@@ -1,4 +1,18 @@
 export default {
+  // FIXME this isn't preventing the error: TypeError: Cannot redefine property: Symbol(async_id_symbol)
+  // Neither does using @endo/init/legacy.js
+  /*
+    Uncaught exception in test/fast-usdc/noble-forwarding.test.ts
+  TypeError: Cannot redefine property: Symbol(async_id_symbol)
+  TypeError: Cannot redefine property: Symbol(async_id_symbol)
+      at InertConstructor.defineProperty (<anonymous>)
+      at setup (file:///home/runner/work/agoric-sdk/agoric-sdk/agoric-sdk/multichain-testing/node_modules/@endo/ses-ava/node_modules/@endo/init/src/node-async_hooks.js:216:10)
+      at file:///home/runner/work/agoric-sdk/agoric-sdk/agoric-sdk/multichain-testing/node_modules/@endo/ses-ava/node_modules/@endo/init/src/node-async_hooks-patch.js:4:1
+      at ModuleJob.run (node:internal/modules/esm/module_job:195:25)
+      at async ModuleLoader.import (node:internal/modules/esm/loader:337:24)
+      at async run (file:///home/runner/work/agoric-sdk/agoric-sdk/agoric-sdk/multichain-testing/node_modules/ava/lib/worker/base.js:244:3)
+      at async file:///home/runner/work/agoric-sdk/agoric-sdk/agoric-sdk/multichain-testing/node_modules/ava/lib/worker/base.js:281:2
+*/
   environmentVariables: {
     LOCKDOWN_OVERRIDE_TAMING: 'severe',
   },
diff --git a/multichain-testing/package.json b/multichain-testing/package.json
index 5f3b11cec7a..7f238c03303 100644
--- a/multichain-testing/package.json
+++ b/multichain-testing/package.json
@@ -9,8 +9,8 @@
     "lint:types": "tsc --noEmit",
     "lint-fix": "yarn lint:eslint --fix",
     "test": "echo 'Run specific test suites:\nyarn test:main (needs `make start`)\nyarn test:fast-usdc (needs `make start FILE=config.fusdc.yaml`)'",
-    "test:main": "ava --config ava.main.config.js",
-    "test:fast-usdc": "FILE=config.fusdc.yaml ava --config ava.fusdc.config.js",
+    "test:main": "LOCKDOWN_OVERRIDE_TAMING=severe ava --config ava.main.config.js",
+    "test:fast-usdc": "LOCKDOWN_OVERRIDE_TAMING=severe FILE=config.fusdc.yaml ava --config ava.fusdc.config.js",
     "starship:setup": "make setup-deps setup-kind",
     "starship:install": "make install",
     "starship:port-forward": "make port-forward",