SN-0916 已核对来源，附原文与上下文。
我想我看出问题在哪了。巧合的是，我最近刚写了一个替代函数来替换出问题的这个，应该能修复。它还没启用，但在 SVN 版本里，它会在 debug.log 打印一条调试消息，显示新的目录值和旧值以便对比。
I think I see where the problem is. Coincidentally, I recently coded a replacement for the function in question which should fix it. It's not enabled yet, but in the SVN version it prints a debug message in debug.log showing the new directory value and old value for comparison.
