Using the new settings from git 2.34 triggers a lot of error dialogs in Sourcetree, so much it cannot be used.

'git log' failed with code 128:'error: unsupported value for gpg.format: ssh

fatal: bad config variable 'gpg.format' in file '/Users/chucknorris/.gitconfig' at line 53

git 2.34.0 changelog:

• In addition to GnuPG, ssh public crypto can be used for object and
  push-cert signing. Note that this feature cannot be used with
  ssh-keygen from OpenSSH 8.7, whose support for it is broken. Avoid
  using it unless you update to OpenSSH 8.8.

https://raw.githubusercontent.com/git/git/master/Documentation/RelNotes/2.34.0.txt

.gitconfig documentation : https://git-scm.com/docs/git-config#Documentation/git-config.txt-gpgprogram