It looks like this is https://github.com/libgit2/libgit2/issues/6612
And one of the comments on that issue from the libgit2 maintainer made me realize there's a workaround. Using github.com as an example since the initial report was having trouble with a channel on github, if you run this: $ ssh-keyscan github.com >> ~/.ssh/known_hosts ...it seems to fix the issue, because ssh-keyscan fetches host keys of all types from the remote host, rather than just one (as seems to happen when you connect to a remote host via SSH normally). Obviously would prefer a proper fix, but this is a relatively low- impact workaround for now.
smime.p7s
Description: S/MIME cryptographic signature
