Apple - Unity Case sensitive file system on macOS
Although MacOS has options to work on Case Sensitive disks, most of its applications [mainly 3rd party apps] do not work well on Case Sensitive disks, for historical reasons. Yet this is a future step to next versions to correctly work on Case Sensitive.
Please use any Case Insensitive disk/share to be able to not run into troubles.
Many applications can't differentiate
thisFile.txt so if you have both on any case sensitive disk, the App may get into trouble. Others may work well. It's like lottery.
MacOS [operating system] works relatively well on case sensitive disk, but 3rd party apps may not work so well.
I found my way to a solution.
Open "Disk utility" application, Press "New Image" and set Format: Mac OS Extended (Journaled). Some would suggest partitioning the harddrive. Instead of partitioning the drive, just create a drive image that is case insensitive. (One can create an Automator workflow or AppleScript that auto opens/expands the drive image whenever Unity is launched.) All one needs is for the Unity projects to be saved on a 'case insensitive' drive. If external is not (desired) option, then the virtual drive -- ah ha, see what I did there?, is nice alternative approach.