Hm, I just submitted a one-diff stack with

gt ss

and it worked fine (it was submitted correctly) except that CLI output was for the previously submitted stack (which happened yesterday):

gt ss
🥞 Validating that this Graphite stack is ready to submit...

✏️  Preparing to submit PRs for the following branches...
▸ anton06-16-api_client_prev_stack_description (Create)
✔ Title … api, client: prev stack description
✔ Body › Edit Body (using vim)
✔ Submit › Publish Pull Request

📨 Pushing to remote and creating/updating PRs...
anton06-16-api_client_prev_stack_description: <https://app.graphite.dev/github/pr/><company>/request-portal/<previous PR ID> (created)