diff --git a/app/services/qwen3_websocket_asr.py b/app/services/qwen3_websocket_asr.py
index 53f6b03..f7028f4 100644
--- a/app/services/qwen3_websocket_asr.py
+++ b/app/services/qwen3_websocket_asr.py
@@ -3156,11 +3156,18 @@ class Qwen3ASRService:
                                     ctx,
                                     visible_observed,
                                 )
-                            partial_display = self._append_only_partial_preview(
-                                ctx,
-                                visible_observed,
-                                native_stream_snapshot=has_native_stream_snapshot,
-                            )
+                            if has_native_stream_snapshot:
+                                # 灰色待确认气泡用于展示 Qwen 当前快照，允许它随模型修正；
+                                # final 候选仍使用上面的稳定文本，避免演示预览影响定稿。
+                                partial_display = self._trim_previous_segment_overlap(
+                                    ctx,
+                                    current,
+                                )
+                            else:
+                                partial_display = self._append_only_partial_preview(
+                                    ctx,
+                                    visible_observed,
+                                )
                             partial_display = self._clip_partial_text(partial_display, ctx)
                             if (
                                 partial_display