diff --git a/src/viewport-three/viewport-host.ts b/src/viewport-three/viewport-host.ts
index cffb2abf..412c2ab6 100644
--- a/src/viewport-three/viewport-host.ts
+++ b/src/viewport-three/viewport-host.ts
@@ -5099,13 +5099,18 @@ export class ViewportHost {
       return;
     }
 
+    if (this.currentTransformSession.kind === "active") {
+      if (this.currentTransformSession.sourcePanelId !== this.panelId) {
+        return;
+      }
+
+      event.preventDefault();
+      this.transformCommitHandler?.(this.currentTransformSession);
+      return;
+    }
+
     const transformHandle = this.pickTransformHandle(event);
-    const interactionSession =
-      this.currentTransformSession.kind === "active"
-        ? this.currentTransformSession.sourcePanelId === this.panelId
-          ? this.currentTransformSession
-          : null
-        : this.getDisplayedTransformSession();
+    const interactionSession = this.getDisplayedTransformSession();
 
     if (transformHandle !== null && interactionSession !== null) {
       event.preventDefault();
@@ -5164,21 +5169,6 @@ export class ViewportHost {
       return;
     }
 
-    if (this.currentTransformSession.kind === "active") {
-      if (this.currentTransformSession.sourcePanelId !== this.panelId) {
-        return;
-      }
-
-      if (
-        this.currentTransformSession.source !== "gizmo" ||
-        this.currentTransformSession.sourcePanelId === this.panelId
-      ) {
-        event.preventDefault();
-        this.transformCommitHandler?.(this.currentTransformSession);
-        return;
-      }
-    }
-
     if (this.toolMode === "create" && this.creationPreview !== null) {
       const previewCenter = this.getCreationPreviewCenter(
         event,
diff --git a/tests/e2e/transform-gizmo-commit.e2e.ts b/tests/e2e/transform-gizmo-commit.e2e.ts
new file mode 100644
index 00000000..cc981e2f
--- /dev/null
+++ b/tests/e2e/transform-gizmo-commit.e2e.ts
@@ -0,0 +1,168 @@
+import { expect, test } from "@playwright/test";
+
+import { createBoxBrush } from "../../src/document/brushes";
+import { createEmptySceneDocument } from "../../src/document/scene-document";
+import {
+  getEditorStoreSnapshot,
+  getViewportCanvas,
+  replaceSceneDocument
+} from "./viewport-test-helpers";
+
+test("confirming a live scale transform over the gizmo commits the current preview", async ({
+  page
+}) => {
+  const pageErrors: string[] = [];
+  const consoleErrors: string[] = [];
+
+  page.on("pageerror", (error) => {
+    pageErrors.push(error.message);
+  });
+
+  page.on("console", (message) => {
+    if (message.type() === "error") {
+      consoleErrors.push(message.text());
+    }
+  });
+
+  await page.goto("/");
+  await page.evaluate((storageKey) => {
+    window.localStorage.removeItem(storageKey);
+  }, "webeditor3d.scene-document-draft");
+  await page.reload();
+
+  test.skip(
+    (await page.getByText("Viewport Unavailable").count()) > 0,
+    "WebGL is unavailable in this Playwright environment."
+  );
+
+  const brush = createBoxBrush({
+    id: "brush-transform-gizmo-commit",
+    name: "Transform Gizmo Commit Fixture",
+    center: {
+      x: 0,
+      y: 1,
+      z: 0
+    },
+    size: {
+      x: 2,
+      y: 2,
+      z: 2
+    }
+  });
+
+  await replaceSceneDocument(page, {
+    ...createEmptySceneDocument({ name: "Transform Gizmo Commit Scene" }),
+    brushes: {
+      [brush.id]: brush
+    }
+  });
+
+  await page.evaluate(({ brushId, target }) => {
+    const store = (window as Window & {
+      __webeditor3dEditorStore?: {
+        getState(): {
+          viewportPanels: {
+            topLeft: {
+              cameraState: {
+                target: { x: number; y: number; z: number };
+                perspectiveOrbit: { radius: number; theta: number; phi: number };
+                orthographicZoom: number;
+              };
+            };
+          };
+        };
+        setSelection(selection: { kind: "brushes"; ids: string[] }): void;
+        setViewportPanelViewMode(panelId: "topLeft", viewMode: "top"): void;
+        setViewportPanelCameraState(
+          panelId: "topLeft",
+          cameraState: {
+            target: { x: number; y: number; z: number };
+            perspectiveOrbit: { radius: number; theta: number; phi: number };
+            orthographicZoom: number;
+          }
+        ): void;
+      };
+    }).__webeditor3dEditorStore;
+
+    if (store === undefined) {
+      throw new Error("Editor store debug hook is unavailable.");
+    }
+
+    const topLeftCameraState = store.getState().viewportPanels.topLeft.cameraState;
+
+    store.setSelection({
+      kind: "brushes",
+      ids: [brushId]
+    });
+    store.setViewportPanelViewMode("topLeft", "top");
+    store.setViewportPanelCameraState("topLeft", {
+      ...topLeftCameraState,
+      target,
+      orthographicZoom: 8
+    });
+  }, { brushId: brush.id, target: brush.center });
+
+  const viewportCanvas = getViewportCanvas(page);
+  await expect(viewportCanvas).toHaveCount(1);
+
+  const canvasBox = await viewportCanvas.boundingBox();
+
+  if (canvasBox === null) {
+    throw new Error("Viewport canvas is missing.");
+  }
+
+  const centerX = canvasBox.x + canvasBox.width * 0.5;
+  const centerY = canvasBox.y + canvasBox.height * 0.5;
+
+  await page.mouse.move(centerX, centerY);
+  await page.keyboard.press("S");
+  await expect(page.getByTestId("viewport-transform-preview-topLeft")).toContainText("scale");
+
+  await page.mouse.move(canvasBox.x + canvasBox.width * 0.72, centerY);
+
+  const previewSnapshot = await getEditorStoreSnapshot(page);
+  expect(previewSnapshot.viewportTransientState.transformSession.kind).toBe("active");
+
+  if (previewSnapshot.viewportTransientState.transformSession.kind !== "active") {
+    throw new Error("Expected an active scale transform session.");
+  }
+
+  expect(previewSnapshot.viewportTransientState.transformSession.operation).toBe("scale");
+
+  if (previewSnapshot.viewportTransientState.transformSession.preview.kind !== "brush") {
+    throw new Error("Expected a brush transform preview.");
+  }
+
+  const previewSizeX =
+    previewSnapshot.viewportTransientState.transformSession.preview.size.x;
+
+  expect(previewSizeX).not.toBe(brush.size.x);
+
+  await page.mouse.click(centerX, centerY);
+
+  const finalSnapshot = await getEditorStoreSnapshot(page);
+  expect(finalSnapshot.viewportTransientState.transformSession.kind).toBe("none");
+
+  const committedSize = await page.evaluate((brushId) => {
+    const store = (window as Window & {
+      __webeditor3dEditorStore?: {
+        getState(): {
+          document: {
+            brushes: Record<string, { size: { x: number; y: number; z: number } }>;
+          };
+        };
+      };
+    }).__webeditor3dEditorStore;
+
+    if (store === undefined) {
+      throw new Error("Editor store debug hook is unavailable.");
+    }
+
+    return store.getState().document.brushes[brushId]?.size ?? null;
+  }, brush.id);
+
+  expect(committedSize).not.toBeNull();
+  expect(committedSize?.x).toBeCloseTo(previewSizeX, 5);
+  expect(pageErrors).toEqual([]);
+  expect(consoleErrors).toEqual([]);
+});