diff --git a/crates/engine/src/atn_cmds/tests.rs b/crates/engine/src/atn_cmds/tests.rs
index 9954f85fee..a3ddcde026 100644
--- a/crates/engine/src/atn_cmds/tests.rs
+++ b/crates/engine/src/atn_cmds/tests.rs
@@ -30,6 +30,32 @@ fn blend_modes_accept_photoshop_string_ids_and_export_canonical_char_ids() {
     }
 }
 
+/// #8454: a Set and a Make layer step whose blend mode is stored as a Photoshop stringID import
+/// with that mode (a Set was unsupported, a Make silently fell back to Normal).
+#[test]
+fn layer_steps_with_string_id_blend_modes_import_with_their_mode() {
+    let set = desc("null").with("null", target_ref("Lyr ")).with("T   ", D::Descriptor(desc("Lyr ").with("Md  ", enm("BlnM", "softLight"))));
+    let make = desc("null").with("null", class_ref("Lyr ")).with("Usng", D::Descriptor(desc("Lyr ").with("Md  ", enm("BlnM", "luminosity"))));
+    let file = AtnFile {
+        name: UnicodeString::new_nul("Blend"),
+        expanded: false,
+        actions: vec![AtnAction {
+            name: UnicodeString::new_nul("A"),
+            items: vec![item("setd", "Set", Some(set)), item("Mk  ", "Make", Some(make))],
+            ..Default::default()
+        }],
+        warnings: vec![],
+    };
+    let imp = import(&atn::write(&file).unwrap()).unwrap();
+    assert!(imp.unsupported.is_empty(), "{:?}", imp.unsupported.iter().map(|u| &u.event).collect::<Vec<_>>());
+    let steps = &imp.actions[0].steps;
+    assert_eq!(steps.len(), 2);
+    assert_eq!(steps[0].0, "layer.setProps");
+    assert_eq!(steps[0].1["blend"], json!("Soft Light"));
+    assert_eq!(steps[1].0, "layer.new.layer");
+    assert_eq!(steps[1].1["mode"], json!("Luminosity"));
+}
+
 fn item(event: &str, label: &str, d: Option<Descriptor>) -> AtnItem {
     let event = match event.as_bytes() {
         [a, b, c, dd] => AtnEvent::Code([*a, *b, *c, *dd]),