diff --git a/chain-test/src/unit/GalaJSONSerializer.ts b/chain-test/src/unit/GalaJSONSerializer.ts
index 056916dec6..1128a02db6 100644
--- a/chain-test/src/unit/GalaJSONSerializer.ts
+++ b/chain-test/src/unit/GalaJSONSerializer.ts
@@ -12,7 +12,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import { plainToInstance } from "class-transformer";
 import * as Logger from "fabric-contract-api/lib/logger";
 
 import { serializeValue } from "../serialize";
@@ -150,17 +149,10 @@ export default class GalaJSONSerializer {
         jsonForValidation = value;
         return { value, jsonForValidation };
       } else if (schema.type === "object") {
-        logger.debug(`${loggerPrefix} fromBuffer assuming data as object`);
-        // so this implies we have some json that should be formed up as an object
-        // need to get the constructor
-        const cnstr = fullschema.components.schemas[schema.$id].cnstr;
-        if (cnstr) {
-          logger.debug(`${loggerPrefix} fromBuffer handling data as object`);
-          jsonForValidation = JSON.parse(stringData);
-          value = plainToInstance(cnstr, jsonForValidation);
-          return { value, jsonForValidation };
-        }
-        logger.debug(`${loggerPrefix} no known constructor`);
+        logger.debug(`${loggerPrefix} fromBuffer handling data as JSON object`);
+        jsonForValidation = JSON.parse(stringData);
+        value = jsonForValidation;
+        return { value, jsonForValidation };
       } else if (schema.type === "array") {
         jsonForValidation = JSON.parse(stringData);
 
diff --git a/chaincode/src/contracts/GalaTransaction.ts b/chaincode/src/contracts/GalaTransaction.ts
index 5a8841c88a..a6629e2c9b 100644
--- a/chaincode/src/contracts/GalaTransaction.ts
+++ b/chaincode/src/contracts/GalaTransaction.ts
@@ -356,6 +356,19 @@ function GalaTransaction<In extends ChainCallDTO, Out>(
     // Ensure this is an actual HLF transaction.
     // If this annotation is missing, you cannot call the chaincode method
     Transaction(isWrite)(target, propertyKey);
+
+    // Overwrite all Reflect metadata types. Fabric stores them by method name,
+    // so duplicate method names across contracts can get the wrong type.
+    // Strict serialization is applied in GalaTransaction via parseValidDTO.
+    // Fabric's generic object schema is sufficient here.
+    const transactions =
+      (Reflect.getMetadata("fabric:transactions", target) as
+        | { name?: string; parameters?: { schema?: unknown }[] }[]
+        | undefined) ?? [];
+    const transaction = transactions.find((entry) => entry.name === propertyKey);
+    for (const parameter of transaction?.parameters ?? []) {
+      parameter.schema = { type: "object" };
+    }
   };
 }
 
diff --git a/chaincode/src/utils/GalaJSONSerializer.ts b/chaincode/src/utils/GalaJSONSerializer.ts
index fda39c6c03..cd60ae4924 100644
--- a/chaincode/src/utils/GalaJSONSerializer.ts
+++ b/chaincode/src/utils/GalaJSONSerializer.ts
@@ -13,7 +13,6 @@
  * limitations under the License.
  */
 import { serialize } from "@gala-chain/api";
-import { plainToInstance } from "class-transformer";
 import * as Logger from "fabric-contract-api/lib/logger";
 
 /*
@@ -147,17 +146,10 @@ export default class GalaJSONSerializer {
         jsonForValidation = value;
         return { value, jsonForValidation };
       } else if (schema.type === "object") {
-        logger.debug(`${loggerPrefix} fromBuffer assuming data as object`);
-        // so this implies we have some json that should be formed up as an object
-        // need to get the constructor
-        const cnstr = fullschema.components.schemas[schema.$id].cnstr;
-        if (cnstr) {
-          logger.debug(`${loggerPrefix} fromBuffer handling data as object`);
-          jsonForValidation = JSON.parse(stringData);
-          value = plainToInstance(cnstr, jsonForValidation);
-          return { value, jsonForValidation };
-        }
-        logger.debug(`${loggerPrefix} no known constructor`);
+        logger.debug(`${loggerPrefix} fromBuffer handling data as JSON object`);
+        jsonForValidation = JSON.parse(stringData);
+        value = jsonForValidation;
+        return { value, jsonForValidation };
       } else if (schema.type === "array") {
         jsonForValidation = JSON.parse(stringData);