There have been problems with this sort of thing with macOS and its use of unicode normalisation NFD rather than the more traditional NFC
The problem can be seen here
The first line Privé/sha3sum.txt: gives
>>> u"é"
u'\xe9'
Wheras the second line gives /Privé:
>>> u"é"
u'e\u0301'
So something - the finder? - is asking for denormalised accents, but when you do it through the cli the are passed as-is.
This is ringing a bell..
From this issue
You could try this option
-o modules=iconv,from_code=UTF-8,to_code=UTF-8-MAC
This should probably be the default on macOS I think.
Do you get the same problem with rclone mount and v1.53?