diff --git a/apps/content/docs/openapi/plugins/smart-coercion.md b/apps/content/docs/openapi/plugins/smart-coercion.md
index 24a78d11e..16cee3b62 100644
--- a/apps/content/docs/openapi/plugins/smart-coercion.md
+++ b/apps/content/docs/openapi/plugins/smart-coercion.md
@@ -150,6 +150,6 @@ This is particularly useful for [Bracket Notation](/docs/openapi/bracket-notatio
 
 ### Array → Map
 
-Support arrays of key-value pairs:
+Support arrays of key-value pairs with **unique keys**:
 
 - `[['key1', 'value1'], ['key2', 'value2']]` → `new Map([['key1', 'value1'], ['key2', 'value2']])`
diff --git a/packages/json-schema/src/coercer.test.ts b/packages/json-schema/src/coercer.test.ts
index 3e320cd20..f6a5b205a 100644
--- a/packages/json-schema/src/coercer.test.ts
+++ b/packages/json-schema/src/coercer.test.ts
@@ -75,6 +75,11 @@ describe('jsonSchemaCoercer', () => {
       { 'type': 'array', 'items': { type: 'array', prefixItems: [{ type: 'number' }, { type: 'boolean' }] }, 'x-native-type': 'map' } as any,
       ['1'],
     )).toEqual(['1'])
+
+    expect(coercer.coerce(
+      { 'type': 'array', 'items': { type: 'array', prefixItems: [{ type: 'number' }, { type: 'boolean' }] }, 'x-native-type': 'map' } as any,
+      [['1', 'true'], ['2', 'false'], ['1', 'false']],
+    )).toEqual([[1, true], [2, false], [1, false]])
   })
 
   it('can coerce enum/const values', () => {
diff --git a/packages/json-schema/src/coercer.ts b/packages/json-schema/src/coercer.ts
index f3c5f3b43..b21e58f7c 100644
--- a/packages/json-schema/src/coercer.ts
+++ b/packages/json-schema/src/coercer.ts
@@ -419,6 +419,12 @@ export class experimental_JsonSchemaCoercer {
       return value
     }
 
-    return new Map(value as [unknown, unknown][])
+    const result = new Map(value as [unknown, unknown][])
+
+    if (result.size !== value.length) {
+      return value
+    }
+
+    return result
   }
 }