rsync remote files: escape with 3 slashes instead of normally 1

[faxotherapy]

This is what I have when pressing tab key; auto-completion with 3 slashes instead of 1:

% rsync -Pazh mini:Downloads/25\\\ Amazing\\\ Facts\\\ About\\\ the\\\ Hidden\\\ History\\\ of\\\ Medicine.pdf .
receiving file list ...
rsync: link_stat "/Users/hfa/Downloads/25\ Amazing\ Facts\ About\ the\ Hidden\ History\ of\ Medicine.pdf" failed: No such file or directory (2)
0 files to consider
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1881) [Receiver=3.2.7]

I systematically need to delete two slahes so as to have only one for the transfer to work. Not convenient.

% rsync -Pazh mini:Downloads/25\ Amazing\ Facts\ About\ the\ Hidden\ History\ of\ Medicine.pdf .
receiving file list ... 1 file to consider

[msva]

rsync completion provided by zsh itself (it come out of the box) and is not the part of this collection.
Please, create an issue about that in zsh's tracker