I had the same problem and ran the following command:
$ sudo apt remove fuse && sudo apt install fuse3 && sudo apt upgrade
Although I got the same warnings about locales, everything went smoothly, so I ran unattended-upgrade:
$ sudo unattended-upgrade -d
As a result, libntfs-3g883 was removed, and several packages are kept back.
Package at-spi2-core has a higher version available, checking if it is from an allowed origin and is not pinned down.
Package batctl has a higher version available, checking if it is from an allowed origin and is not pinned down.
Package cockpit has a higher version available, checking if it is from an allowed origin and is not pinned down.
Package cockpit-bridge has a higher version available, checking if it is from an allowed origin and is not pinned down.
Package cockpit-networkmanager has a higher version available, checking if it is from an allowed origin and is not pinned down.
Package cockpit-packagekit has a higher version available, checking if it is from an allowed origin and is not pinned down.
Package cockpit-pcp has a higher version available, checking if it is from an allowed origin and is not pinned down.
Package cockpit-storaged has a higher version available, checking if it is from an allowed origin and is not pinned down.
Package cockpit-system has a higher version available, checking if it is from an allowed origin and is not pinned down.
Package cockpit-ws has a higher version available, checking if it is from an allowed origin and is not pinned down.
Package freedombox-doc-en has a higher version available, checking if it is from an allowed origin and is not pinned down.
Package freedombox-doc-es has a higher version available, checking if it is from an allowed origin and is not pinned down.
Package guile-2.2-libs has a higher version available, checking if it is from an allowed origin and is not pinned down.
Package guile-2.2-libs is kept back because a related package is kept back or due to local apt_preferences(5).
Package libatspi2.0-0 has a higher version available, checking if it is from an allowed origin and is not pinned down.
Extracting content from /var/log/unattended-upgrades/unattended-upgrades-dpkg.log since 2021-09-02 14:21:30
Nevertheless, it appears I am now running v. 21.7. Should there be any cause for concern?