A full width slash U+FF0F, e.g. in イニシエノウタ／デボル, in combination with replace non-ascii gets turned into an ASCII slash, leading to a directory being created.

This happens even though picard.util.textencoding.replace_non_ascii gets called with pathsave=True.

See chatlogs at https://chatlogs.metabrainz.org/libera/musicbrainz/2021-06-19/?msg=4823412&page=1