diff --git a/server-rs/crates/api-server/src/tripo3d/job.rs b/server-rs/crates/api-server/src/tripo3d/job.rs
index 0c63406b1..31a6bc9a8 100644
--- a/server-rs/crates/api-server/src/tripo3d/job.rs
+++ b/server-rs/crates/api-server/src/tripo3d/job.rs
@@ -157,7 +157,31 @@ mod tests {
     }
 
     #[test]
-    fn job_request_rejects_payload_without_fingerprint_stripping_support() {
+    fn job_request_stays_strict_after_stripping_platform_fingerprint() {
+        // 摘指纹只摘平台注入的那一个字段：其余未知字段仍走 deny_unknown_fields。
+        let payload_with_unknown_field = json!({
+            "generation": {
+                "prompt": "一只木箱",
+                "model": "v3.1-20260211",
+                "texture": true,
+                "pbr": true,
+                "textureQuality": "standard",
+                "geometryQuality": "standard",
+                "quad": false,
+                "smartLowPoly": false,
+                "generateParts": false
+            },
+            "target": { "kind": "projectResource", "projectId": "project-1" },
+            "_externalApiRequestFingerprint": "fingerprint-1",
+            "unexpectedField": true
+        })
+        .to_string();
+        assert!(
+            parse_model3d_job_request(MODEL3D_TEXT_TO_MODEL_JOB_KIND, &payload_with_unknown_field)
+                .is_err()
+        );
+
+        // 缺 generation / target 的 payload 与未知 job kind 都必须被拒。
         let payload = json!({ "prompt": "一只木箱" }).to_string();
         assert!(parse_model3d_job_request(MODEL3D_TEXT_TO_MODEL_JOB_KIND, &payload).is_err());
         assert!(parse_model3d_job_request("unknown_job_kind", &payload).is_err());