CSync failed to access an accented file and stucks everything

Hi all,
I had a file called “utilità.xxx”, with an accented A at last character.
I noticed that Nextcloud client (both Windows and Mac) stucks when get to download that file: “CSync failed to access utilità.xxx” and all restart with “checking for changes”, and again and again and again, without download anything: many subfolders, and no files downloaded. So I had an idea: rename “utilità” in “utility” from terminal, then try with

sudo -u www-data php /var/www/nextcloud/occ files:scan --all -v

and retry. However the client has the some problem: it try downloading again the old file “utilità” but it doesn’t exist anymore! I tried with

sudo -u www-data php /var/www/nextcloud/occ files:cleanup -v

but it always reply me “0 orphaned file cache entries deleted”.
Can anyone help me?