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tomx2 - calibre libraries should be regarded as a black box.
The folder and file names used in calibre libraries must be valid for 3 desktop operating systems (Windows, MacOS, and Linux) and several file systems (e.g. FAT32, NFS, Ext2/3/4, NTFS, HFS+, APFS, ReFS (?) etc). To write and manage individually tailored code for the capabilities, idiosyncrasies, and variations of every combination of OS and FS would be a nightmare. Hence a lowest common denominator approach was taken - e.g. names are limited in length, names are ASCII-ized.
There's a FAQ on this issue in the calibre manual ==>>
Why doesn’t calibre let me store books in my own directory structure?, and there's a sticky here at MR ==>>
Want to change folder structure or file names in the Calibre library?
The Send to Device and Save to Disk tools provide for user defined naming templates to create the folder and file names they send and save - e.g. because the article 'The' has been moved suspect your Save to Disk template is
{title_sort} - {authors} - or you have set the
title column to
title_sort.
BR