I just pushed one branch named fix/$slice-bug to one of our repos, and it gave me an error on CircleCI:
remote: Counting objects: 213, done.
remote: Compressing objects: 100% (92/92), done.
remote: Total 213 (delta 61), reused 95 (delta 34), pack-reused 80
Receiving objects: 100% (213/213), 146.58 KiB | 0 bytes/s, done.
Resolving deltas: 100% (96/96), done.
Checking connectivity... done.
Warning: Permanently added the RSA host key for IP address '192.30.253.113' to the list of known hosts.
fatal: Couldn't find remote ref fix/-bug
Exited with code 128