diff --git a/test/es-module/test-esm-dynamic-import-assertion.mjs b/test/es-module/test-esm-dynamic-import-assertion.mjs
index 738fc965f5a064..605f623c15fd89 100644
--- a/test/es-module/test-esm-dynamic-import-assertion.mjs
+++ b/test/es-module/test-esm-dynamic-import-assertion.mjs
@@ -2,32 +2,40 @@
 import '../common/index.mjs';
 import { rejects, strictEqual } from 'assert';
 
-const jsModuleUrl = 'data:text/javascript,export{}';
+const jsModuleDataUrl = 'data:text/javascript,export{}';
 
 await rejects(
-  import(`data:text/javascript,import${JSON.stringify(jsModuleUrl)}assert{type:"json"}`),
+  import(`data:text/javascript,import${JSON.stringify(jsModuleDataUrl)}assert{type:"json"}`),
   { code: 'ERR_FAILED_IMPORT_ASSERTION' }
 );
 
 await rejects(
-  import(jsModuleUrl, {assert:{type:'json'}}),
+  import(jsModuleDataUrl, { assert: { type: 'json' } }),
   { code: 'ERR_FAILED_IMPORT_ASSERTION' }
 );
 
 {
-  const secret = await import(
-    '../fixtures/experimental.json',
-    {assert: { type: 'json' }}
-  );
+  const [secret0, secret1] = await Promise.all([
+    import('../fixtures/experimental.json'),
+    import(
+      '../fixtures/experimental.json',
+      { assert: { type: 'json' } }
+    ),
+  ]);
 
-  strictEqual(secret.default.ofLife, 42);
+  strictEqual(secret0.default.ofLife, 42);
+  strictEqual(secret1.default.ofLife, 42);
 }
 
 {
-  const secret = await import(
-    'data:application/json,{"ofLife":42}',
-    {assert: { type: 'json' }}
-  );
+  const [secret0, secret1] = await Promise.all([
+    import('data:application/json,{"ofLife":42}'),
+    import(
+      'data:application/json,{"ofLife":42}',
+      { assert: { type: 'json' } }
+    ),
+  ]);
 
-  strictEqual(secret.default.ofLife, 42);
+  strictEqual(secret0.default.ofLife, 42);
+  strictEqual(secret1.default.ofLife, 42);
 }
diff --git a/test/es-module/test-esm-import-assertion-3.mjs b/test/es-module/test-esm-import-assertion-3.mjs
new file mode 100644
index 00000000000000..b523b11c524896
--- /dev/null
+++ b/test/es-module/test-esm-import-assertion-3.mjs
@@ -0,0 +1,9 @@
+// Flags: --experimental-json-modules
+import '../common/index.mjs';
+import { strictEqual } from 'assert';
+
+import secret0 from '../fixtures/experimental.json' assert { type: 'json' };
+import secret1 from '../fixtures/experimental.json';
+
+strictEqual(secret0.ofLife, 42);
+strictEqual(secret1.ofLife, 42);