Bug#1145350: gnome-shell-extension-wsmatrix: FTBFS: dpkg-deb: error: parsing file 'debian/gnome-shell-extension-wsmatrix/DEBIAN/control' near line 6 package 'gnome-shell-extension-wsmatrix':

Package: src:gnome-shell-extension-wsmatrix
Version: 12.3-1
Severity: serious
Tags: ftbfs forky sid

Dear maintainer:

During a rebuild of all packages in unstable, this package failed to build.

Below you will find the last part of the build log (probably the most
relevant part, but not necessarily). If required, the full build log
is available here:

https://people.debian.org/~sanvila/build-logs/202608/

About the archive rebuild: The build was made on virtual machines from AWS,
using sbuild and a reduced chroot with only build-essential packages.

If you cannot reproduce the bug please contact me privately, as I
am willing to provide ssh access to a virtual machine where the bug is
fully reproducible.

If this is really a bug in one of the build-depends, please use
reassign and add an affects on src:gnome-shell-extension-wsmatrix, so that this is still
visible in the BTS web page for this package.

Thanks.

--------------------------------------------------------------------------------
[...]
   dh_compress
   dh_installdeb
   dh_computeautosubstvars
   debian/rules override_dh_gencontrol
make[1]: Entering directory '/<<PKGBUILDDIR>>'
/bin/sh: 1: python3: not found
/bin/sh: 1: python3: not found
dh_gencontrol -- \
	-Vgnome:MinimumVersion= \
	-Vgnome:MaximumVersion=
dpkg-gencontrol: warning: Depends field of package gnome-shell-extension-wsmatrix: substitution variable ${misc:Depends} used, but is not defined
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
   dh_md5sums
   dh_builddeb
dpkg-deb: error: parsing file 'debian/gnome-shell-extension-wsmatrix/DEBIAN/control' near line 6 package 'gnome-shell-extension-wsmatrix':
 'Depends' field, reference to 'gnome-shell': version '~': version number does not start with digit
dh_builddeb: error: dpkg-deb --root-owner-group --build debian/gnome-shell-extension-wsmatrix .. returned exit code 2
dh_builddeb: error: Aborting due to earlier error
make: *** [debian/rules:6: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2
--------------------------------------------------------------------------------