I have a Leap 15.4, running (among many other things) a few git repos,
accessible under repo urls of the form "ssh://user@host/path/repo.git".

Lately, any TW host just "hangs" when I'm trying to do a git pull.

Hosts running git versions older than what is in TW now work fine, i.e. debian,
RHEL8, or leap up to 15.4 systems.

a git trace of such a hanging pull:

mathias@mio:~/work/ansible/ansible-updates> GIT_TRACE=true git pull
10:02:11.996220 git.c:460               trace: built-in: git pull
10:02:11.996568 run-command.c:655       trace: run_command: git fetch
--update-head-ok
10:02:11.998991 git.c:460               trace: built-in: git fetch
--update-head-ok
10:02:11.999629 run-command.c:655       trace: run_command: unset GIT_PREFIX;
GIT_PROTOCOL=version=2 ssh -o SendEnv=GIT_PROTOCOL lemmy@akari.eregion.home
'git-upload-pack '\''/srv/git/ansible-updates.git'\'''
10:02:12.843149 run-command.c:655       trace: run_command: git rev-list
--objects --stdin --not --all --quiet --alternate-refs