Well, that’s my question. Never came to my attention before, but if I understand everything correctly, that’s ridiculous. How can it be, that Figma ignores everything but the first entry while renaming layers? 
For example.
I want to rename layers like this:
UI/Desktop/Buttons/Default Button
into this:
UI / Desktop / Buttons / Default Button
Do I really need to call the Rename modal window several times in order to add spaces around all the slashes?