Can't use git add with --patch option

Question

I recently updated Git to version 2.7.2.windows.1 (I am running Windows 7 64-bit). Since the update, I have been unable to run git add with the -p option on files within a certain directory (or its subdirectories) whose name is _ (an underscore).

git status correctly reports that my file has changes:

PS C:\Users\Carl\www\dl> git status On branch develop Your branch is up-to-date with 'origin/develop'. Changes not staged for commit:   (use "git add <file>..." to update what will be committed)   (use "git checkout -- <file>..." to discard changes in working directory)          modified:   _/php/class.Menu.php 

And I can add the entire file with a simple git add, or by specifying the file by name. But if I try to include the -p or --patch option (both variations produce the same results), Git reports that there are no changes:

PS C:\Users\Carl\www\dl> git add -p .\_\php\class.Menu.php No changes. 

This only happens for files within the _ directory, but it doesn't matter whether I cd into that directory to run the git add command without having to explicitly specify a path with an underscore in it; it still doesn't work:

PS C:\Users\Carl\www\dl\_\php> git add -p .\class.Menu.php No changes. 

I had initially thought this problem was related to a similar one I encountered recently on files within the _ directory, which I asked about here. However, that problem appears to have been related to Posix path conversion in MinGW, whereas this problem occurs whether I use Git Bash, Windows PowerShell, or cmd.exe.

As I said in that previous question, I believe underscores to be valid in file/directory names. Additionally, I am not the owner of the project so I cannot rename the directory or move the file.

Is this a bug in Git? Are there any additional steps I can take to determine what the underlying issue is?