当源 AvatarMask 发生了变化时，返回 true。只有在 ModelImporterClipAnimation.maskType 设置为 ClipAnimationMaskType.CopyFromOther 才会发生这种情况 要强行重新加载遮罩，只需将 ModelImporterClipAnimation.maskSource 设置为需要的 AvatarMask 即可。
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