--- a/src/engine/metal/qwen_mtplx/owner.rs
+++ b/src/engine/metal/qwen_mtplx/owner.rs
@@ -1068,3 +1068,7 @@
 #[cfg(test)]
 #[path = "issue106_product.rs"]
 mod issue106_product;
+
+#[cfg(test)]
+#[path = "issue107_product.rs"]
+mod issue107_product;
--- /dev/null
+++ b/src/engine/metal/qwen_mtplx/issue107_product.rs
@@ -0,0 +1,89 @@
+//! Long multi-image request and cache compatibility through the product owner.
+use super::*;
+use crate::settings::{
+    GenerationPreferences, ReasoningMode, RuntimePreferences, SpeculativePreferences,
+    effective_settings,
+};
+use base64::Engine as _;
+
+#[test]
+#[ignore = "installed model plus vision tower; serial external memory supervisor required"]
+fn issue107_vision_product() {
+    let root = std::path::PathBuf::from(std::env::var_os("DS4_QWEN38_ARTIFACTS").unwrap());
+    let image = std::fs::read(std::env::var_os("DS4_QWEN_VISION_IMAGE").unwrap()).unwrap();
+    let directory = std::path::PathBuf::from(std::env::var_os("DS4_ISSUE107_DIR").unwrap());
+    std::fs::create_dir_all(&directory).unwrap();
+    let settings = effective_settings(
+        crate::model::ModelChoice::Qwen38FlashNext,
+        &GenerationPreferences {
+            context_tokens: 8192,
+            max_generated_tokens: 1,
+            system_prompt: String::new(),
+            temperature: Some(0.),
+            top_p: Some(0.95),
+            min_p: Some(0.),
+            seed: Some(1),
+            reasoning_mode: ReasoningMode::Low,
+        },
+        &RuntimePreferences {
+            speculative: SpeculativePreferences {
+                glm_mtp: true,
+                ..Default::default()
+            },
+            ..Default::default()
+        },
+        root.parent().unwrap(),
+    )
+    .unwrap();
+    let marker = crate::engine::vision_data_marker(&format!(
+        "data:image/png;base64,{}",
+        base64::engine::general_purpose::STANDARD.encode(&image)
+    ));
+    let messages = [ChatTurn {
+        user: true,
+        tool: false,
+        system: false,
+        skip_previous_eos: false,
+        reasoning: None,
+        reasoning_complete: true,
+        content: format!("Describe these images{marker}{marker}"),
+    }];
+    let mut owner = QwenExecutor::open(&settings.engine).unwrap();
+    owner.policy.store_min_suffix = Some(0);
+    let metrics = Metrics::new(&directory.join("metrics"));
+    let (out, complete) = owner
+        .generate(
+            &messages,
+            &settings.turn,
+            &AtomicBool::new(false),
+            &metrics,
+            |p, _, _| {
+                eprintln!("#107 prefill {p}");
+            },
+            |_, _| {},
+        )
+        .unwrap();
+    assert!(complete);
+    assert!(out.prompt_tokens > 2048);
+    assert_eq!(out.cached_tokens, 0);
+    let saved = owner.live.current.as_ref().unwrap();
+    let logits = owner.execution.values_f32(&saved.logits).unwrap();
+    std::fs::write(
+        directory.join("long-final.f32"),
+        logits
+            .iter()
+            .flat_map(|v| v.to_le_bytes())
+            .collect::<Vec<_>>(),
+    )
+    .unwrap();
+    std::fs::write(directory.join("long-input.json"),serde_json::to_vec(&serde_json::json!({"ids":saved.token_ids,"images":owner.live.current_images,"prompt_tokens":out.prompt_tokens})).unwrap()).unwrap();
+    owner
+        .save_checkpoint(&directory.join("long.bin"), [107; 32], &mut |_| {})
+        .unwrap();
+    println!(
+        "{}",
+        serde_json::json!({"case":"vision_long","prompt_tokens":out.prompt_tokens,"cached_tokens":out.cached_tokens,
+        "tokens":owner.live.current.as_ref().unwrap().token_ids,"text":out.message.content,"reasoning":out.message.reasoning,
+        "logits_sha256":crate::engine::metal::qwen_mtplx_tests::hex_digest(&logits.iter().flat_map(|v|v.to_le_bytes()).collect::<Vec<_>>())})
+    );
+}