I am using Sourcetree 4.1.6 on a M1 Mac without rosetta 2.

All things works fine, but I have to switch from the embedded git to the System git (provided by apple).

% /Applications/SourceTree.app/Contents/Resources/git_local/bin/git
zsh: bad CPU type in executable: /Applications/SourceTree.app/Contents/Resources/git_local/bin/git 

My main problem is, that I have to use git-crypt. The previous hack with 

sudo ln -s /opt/homebrew/bin/git-crypt /Applications/SourceTree.app/Contents/Resources/git_local/bin/git-crypt 

didn't work in the case of system git.

In case of system git with git-crypt (at console is it working), I got the error:

'git status' failed with code 128:'"git-crypt" clean: git-crypt: command not found
error: external filter '"git-crypt" clean' failed 127
error: external filter '"git-crypt" clean' failed
fatal: _secrets/filessss_: clean filter 'git-crypt' failed
'

(I don't understand why system git with system git-crypt not work in sourcetree, but I think that is another problem.)

I think the issue could be resolved, if sourcetree embedd an arm64 git solution.