In a separate occasion, I also got that issue (but worse). I once marked a NTFS folder as case-sensitive to help root out all case mismatch bugs (to get a C++ project eventually building on Linux), but then Visual Studio and CMake started spitting out "file not found" errors even for the correct case! I had somehow produced a "cursed" folder that could not be used for building code until I copied (not moved) its contents to a regular case-insensitive NTFS folder.