train model is finished. But not end process, app not respond, can only close cmd

I train model is finished, but after model saved. cmd it not respond try to enter or restart train again, but got same result

```
CUDA SETUP: Loading binary D:\xxxx\kohya_ss\venv\lib\site-packages\bitsandbytes\libbitsandbytes_cuda116.dll...
use 8-bit AdamW optimizer | {}
running training / 学習開始
num train images * repeats / 学習画像の数×繰り返し回数: 1500
num reg images / 正則化画像の数: 0
num batches per epoch / 1epochのバッチ数: 1500
num epochs / epoch数: 1
batch size per device / バッチサイズ: 1
total train batch size (with parallel & distributed & accumulation) / 総バッチサイズ（並列学習、勾配合計含む）: 1
gradient accumulation steps / 勾配を合計するステップ数 = 1
total optimization steps / 学習ステップ数: 1500
steps: 0%| | 0/1500 [00:00

Start by reproducing the training run from the final log, including the Windows CUDA setup and bitsandbytes DLL loading shown in the report. Compare the process state immediately after “model saved” and the final progress line; done means the command returns control and the application responds without requiring the command window to be closed.

Written by the indexing model from the issue text.