It seems that the version of GNOME in the present release is no longer maintained by GNOME:
https://gitlab.gnome.org/GNOME/gnome-clocks/-/issues/246#note_1503185

It also seems that a security conscious distro should not be shipping a version of GNOME that is no longer maintained.

Please update GNOME to a version that is maintained by GNOME.

Linux machine 5.10.0-16-amd64 #1 SMP Debian 5.10.127-1 (2022-06-30) x86_64 GNU/Linux