Hey there @galitsyn
Thanks for the feedback, could you please check the File System that you're using on your main MacOS Hard Drive and verify if there's anything related to "... ( Case-sensitive )" ?
i.e : one common MacOS File System used when formatting HD is "Mac OS Extended (Journaled)", but another available option is "Mac OS Extended (Case-sensitive, Journaled)".
You can check this by going to Utilities --> then run Disk Utility, select your MacOS HD, right click & select "Get Info" and check the "File System" information in the new pop-up window.
In my case I'm able to change the Presets folder name to either capital "P" or minimal "p" and it doesn't make any difference, after re-scanning the plugin inside Ableton's Live : I'm still able to see all presets inside KICK 2.
Tested under MacOS High-Sierra and the main HD using APFS File System here.