DXT5格式的NPOT图，异步加载后，九宫格显示有问题

在同步加载图片时没有问题，但是在异步加载图片时，由于调用了NTexture.Reload方法，NTexture的_region从568x385变成了512x512，导致计算九宫格出现了错误

原图
![Image](https://github.com/user-attachments/assets/0c760630-208b-45ec-989b-2423d9013b09)

九宫格
![Image](https://github.com/user-attachments/assets/98a3a94b-4023-41f9-a738-faaa49f9e14f)

同步加载
![Image](https://github.com/user-attachments/assets/f5c42bc5-82ed-41cf-adeb-c9547308e126)

异步加载
![Image](https://github.com/user-attachments/assets/aa880ea7-2480-4895-9dc0-6772907c6ae0)

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DXT5格式的NPOT图，异步加载后，九宫格显示有问题 #245

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DXT5格式的NPOT图，异步加载后，九宫格显示有问题 #245

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