diff --git a/packages-user/data-base/src/map/mapLayer.ts b/packages-user/data-base/src/map/mapLayer.ts
index 00c5dbf..be45f3e 100644
--- a/packages-user/data-base/src/map/mapLayer.ts
+++ b/packages-user/data-base/src/map/mapLayer.ts
@@ -213,10 +213,12 @@ export class MapLayer
     event(x: number, y: number): ILayerEventView | null {
         if (!this.inMap(x, y)) return null;
         const index = y * this.width + x;
-        return this.pointEvents.getOrInsertComputed(
-            index,
-            () => new LayerEventView()
-        );
+        let eventView = this.pointEvents.get(index);
+        if (!eventView) {
+            eventView = new LayerEventView();
+            this.pointEvents.set(index, eventView);
+        }
+        return eventView;
     }
 
     getPointEvent(x: number, y: number): ReadonlyMap<number, string> | null {
diff --git a/packages-user/data-common/src/replay/sandbox.ts b/packages-user/data-common/src/replay/sandbox.ts
index add7e46..376eca1 100644
--- a/packages-user/data-common/src/replay/sandbox.ts
+++ b/packages-user/data-common/src/replay/sandbox.ts
@@ -116,7 +116,7 @@ export class ReplaySandbox
     }
 
     async step(): Promise<boolean> {
-        if (!this.pausing || !this.playing || this.ended) return false;
+        if (!this.playing || this.ended) return false;
         if (this.reader.expired) {
             logger.warn(156);
             return false;
diff --git a/packages-user/data-state/src/core.ts b/packages-user/data-state/src/core.ts
index 05b4cca..51e7b58 100644
--- a/packages-user/data-state/src/core.ts
+++ b/packages-user/data-state/src/core.ts
@@ -46,7 +46,6 @@ import {
 } from '@user/data-system';
 import {
     CommonAuraConverter,
-    EnemyLegacyBridge,
     GuardAuraConverter,
     MainDamageCalculator,
     MainEnemyFinalEffect,
diff --git a/packages-user/data-state/test/fixtures/closed-loop.ts b/packages-user/data-state/test/fixtures/closed-loop.ts
new file mode 100644
index 0000000..93dbed3
--- /dev/null
+++ b/packages-user/data-state/test/fixtures/closed-loop.ts
@@ -0,0 +1,113 @@
+import { AnonTokyoInterpreter } from 'anon-tokyo';
+import {
+    EventTrigger,
+    FaceDirection,
+    IReplaySandbox,
+    TileType
+} from '@user/data-common';
+import { IGameMap, IMapLayer } from '@user/data-base';
+import { IReadonlyBlockEvent } from '@user/data-system';
+import { ReplaySystem } from '../../../data-common/src/replay/system';
+import { createCoreState, CoreState } from '../../src/core';
+
+export interface IClosedLoopFixture {
+    readonly state: CoreState;
+    readonly map: IGameMap;
+    readonly eventLayer: IMapLayer;
+    readonly replay: ReplaySystem;
+    readonly sandbox: IReplaySandbox;
+    readonly eventCompleted: () => boolean;
+}
+
+const MOVE_RIGHT_COMMAND = 1;
+
+export function createClosedLoopFixture(): IClosedLoopFixture {
+    const state = createCoreState();
+    state.tileStore.addTile({
+        num: 1,
+        id: 'floor',
+        events: { 10: 'mutate-map' },
+        type: TileType.Terrain,
+        pass: { onlyEvents: false, outPass: 0b1111, inPass: 0b1111 },
+        eventPass: true
+    });
+    state.tileStore.addTile({
+        num: 2,
+        id: 'changed-floor',
+        events: {},
+        type: TileType.Terrain,
+        pass: { onlyEvents: false, outPass: 0b1111, inPass: 0b1111 },
+        eventPass: true
+    });
+
+    const map = state.maps.fromRaw({
+        floorId: 'F1',
+        width: 3,
+        map: { 20: [1, 1, 1] },
+        layerAlias: { 20: 'event' },
+        events: { 20: {} }
+    });
+    if (!map || !map.eventLayer) {
+        throw new Error('closed-loop fixture map was not created');
+    }
+    const eventLayer = map.eventLayer;
+    let completed = false;
+    const event: IReadonlyBlockEvent = {
+        interpreter: new AnonTokyoInterpreter({
+            builtInFunctions: [],
+            globalFunctions: []
+        }),
+        trigger: EventTrigger.OnEnter,
+        rawEvent: [],
+        compiled: null,
+        compile: () => null,
+        execute: async (_param, env) => {
+            await Promise.resolve();
+            if (!env.layer || !env.triggerLocator) {
+                throw new Error('closed-loop event lost its map source');
+            }
+            env.layer.setBlock(2, env.triggerLocator.x, env.triggerLocator.y);
+            completed = true;
+        }
+    };
+    state.eventStore.addEvent('mutate-map', event);
+
+    state.hero.location.setFloor('F1');
+    state.hero.location.setPos(0, 0);
+    state.hero.location.mover.setFaceDir(FaceDirection.Right);
+
+    const replay = new ReplaySystem();
+    replay.registerCommand(MOVE_RIGHT_COMMAND, {
+        execute: async step => {
+            if (step.params.length !== 0) return false;
+            const mover = state.hero.location.mover;
+            mover.step(FaceDirection.Right);
+            const controller = mover.start();
+            if (!controller) return false;
+            await controller.onEnd;
+            return true;
+        }
+    });
+    replay.record(MOVE_RIGHT_COMMAND);
+
+    const reset = () => {
+        eventLayer.setMapRef(new Uint32Array([1, 1, 1]));
+        state.hero.location.setFloor('F1');
+        state.hero.location.setPos(0, 0);
+        state.hero.location.mover.setFaceDir(FaceDirection.Right);
+        completed = false;
+    };
+    const sandbox = replay.createReplaySandbox({
+        route: replay.route,
+        reseter: { reset }
+    });
+
+    return {
+        state,
+        map,
+        eventLayer,
+        replay,
+        sandbox,
+        eventCompleted: () => completed
+    };
+}
diff --git a/packages-user/data-state/test/nodeTracer.test.ts b/packages-user/data-state/test/nodeTracer.test.ts
new file mode 100644
index 0000000..9f5934f
--- /dev/null
+++ b/packages-user/data-state/test/nodeTracer.test.ts
@@ -0,0 +1,45 @@
+import { describe, expect, it } from 'vitest';
+import { createCoreState } from '../src/core';
+import { createClosedLoopFixture } from './fixtures/closed-loop';
+
+describe('Node replay tracer', () => {
+    // 验证 Node 宿主无需浏览器全局即可创建相互独立的内存状态
+    it('creates independent Node-safe CoreState instances', () => {
+        const first = createCoreState();
+        const second = createCoreState();
+
+        expect(first).not.toBe(second);
+        expect(first.saveSystem).not.toBe(second.saveSystem);
+        expect(first.saveSystem.constructor.name).toBe('MemorySaveSystem');
+        expect(second.saveSystem.constructor.name).toBe('MemorySaveSystem');
+    });
+
+    // 验证 replay 等待真实移动与事件完成后才结束并改变事件层矩阵
+    it('replays movement, awaits event mutation, and ends normally', async () => {
+        const fixture = createClosedLoopFixture();
+
+        expect(fixture.eventLayer.getBlock(0, 0)).toBe(1);
+        expect(fixture.eventLayer.getBlock(1, 0)).toBe(1);
+
+        fixture.sandbox.play();
+        await waitForEnded(fixture.sandbox);
+
+        expect(fixture.sandbox.ended).toBe(true);
+        expect(fixture.sandbox.getReplayed()).toBe(1);
+        expect(fixture.state.hero.location.x).toBe(1);
+        expect(fixture.state.hero.location.y).toBe(0);
+        expect(fixture.eventCompleted()).toBe(true);
+        expect(fixture.eventLayer.getBlock(1, 0)).toBe(2);
+    });
+});
+
+async function waitForEnded(sandbox: {
+    readonly ended: boolean;
+}): Promise<void> {
+    for (let index = 0; index < 100 && !sandbox.ended; index++) {
+        await new Promise<void>(resolve => setTimeout(resolve, 0));
+    }
+    if (!sandbox.ended) {
+        throw new Error('replay did not reach its end state');
+    }
+}