diff --git a/crates/ui-egui/src/panels/format_shape.rs b/crates/ui-egui/src/panels/format_shape.rs
index 48d5df9d..002226d9 100644
--- a/crates/ui-egui/src/panels/format_shape.rs
+++ b/crates/ui-egui/src/panels/format_shape.rs
@@ -477,10 +477,20 @@ fn fx_slider(
         } else {
             ui.data_mut(|d| d.remove::<f64>(sid));
         }
+        // A slider that only had focus when another control took it (the Reflection "None" button)
+        // must not commit its stale value: only an edit the user made is committed on losing focus.
+        let edited_id = sid.with("edited");
+        if r.changed() {
+            ui.data_mut(|d| d.insert_temp(edited_id, true));
+        }
+        let edited = ui.data_mut(|d| d.get_temp::<bool>(edited_id)).unwrap_or(false);
         // `changed()` alone also fires when the slider only rounds the shown value (55.000000000000007 to 55),
         // which re-added a reflection the pane had just cleared; a keyboard edit has focus.
-        if r.drag_stopped() || r.lost_focus() || (r.changed() && !r.dragged() && r.has_focus()) {
-            ui.data_mut(|d| d.remove::<f64>(sid));
+        if r.drag_stopped() || (r.lost_focus() && edited) || (r.changed() && !r.dragged() && r.has_focus()) {
+            ui.data_mut(|d| {
+                d.remove::<f64>(sid);
+                d.remove::<bool>(edited_id);
+            });
             run(app, "shape.effects", json!({key: {prop: v * scale}}));
         }
     });
diff --git a/crates/ui-egui/src/reflection_pane_tests.rs b/crates/ui-egui/src/reflection_pane_tests.rs
index dbedd524..dda97afd 100644
--- a/crates/ui-egui/src/reflection_pane_tests.rs
+++ b/crates/ui-egui/src/reflection_pane_tests.rs
@@ -41,3 +41,33 @@ fn reflection_none_clears_after_a_second_preset() {
     h.run_steps(4);
     assert!(!has_reflection(&h), "None clears the reflection");
 }
+
+#[test]
+fn reflection_none_stays_cleared_when_a_slider_only_had_focus() {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    let id = s.execute("shape.insert", &json!({"preset": "rect", "rect": [72.0, 36.0, 144.0, 108.0]})).unwrap()["id"].as_u64().unwrap();
+    s.execute("edit.select", &json!({"ids": [id]})).unwrap();
+    let mut app = SlideApp::new(s, Services::default());
+    app.ui.pane = Some("format".into());
+    app.ui.format_tab = "effects".into();
+    let mut h = Harness::builder().with_size(egui::vec2(1400.0, 900.0)).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h.get_by_label("Tight").click();
+    h.run_steps(4);
+    // Focus a reflection slider without editing it, then click "None": the slider's value must not
+    // be written back over the cleared reflection.
+    // The reflection's Size comes before the glow's (the same label).
+    h.get_all_by_role_and_label(egui::accesskit::Role::Slider, "Size").next().unwrap().focus();
+    h.run_steps(4);
+    assert!(h.get_all_by_role_and_label(egui::accesskit::Role::Slider, "Size").next().unwrap().is_focused(), "the reflection size slider has focus");
+    h.get_all_by_label("None").last().unwrap().click();
+    h.run_steps(4);
+    assert!(!has_reflection(&h), "a slider that only had focus does not re-add the reflection");
+}