File system case detection broken

For some time now I have the problem that some of my projects issue a warning claiming that they are located on a case-sensitive filesystem.

However, all of my projects are located on the same local Windows NTFS drive. Changing the setting

idea.case.sensitive.fs

will disable the warning for those projects. However, the other half of my projects will then issue that warning instead.

Is there anything I can do about that? If not, please either fix the detection, or provide another setting that allows disabling that annoying warning.