• VSCode Version: 1.30.1
• OS Version: Windows 10 - build 1803

Steps to Reproduce:

1. Create new branch "git checkout -b @JA/feature1"
2. VS Code display branch like below
   
3. Click on publish icon, which spins and does nothing and produces this log.

git push -u origin refs/heads/@JA/feature1
To https://xxxxxxx.visualstudio.com/MyProject/_git/MyProject

• [new branch] @JA/feature1 -> @JA/feature1

git status -z -u
git symbolic-ref --short HEAD
git rev-parse --symbolic-full-name @JA/feature1
git rev-parse refs/heads/@JA/feature1
git rev-parse --symbolic-full-name refs/heads/@JA/feature1@{u}
fatal: no such branch: 'refs/heads/@JA/feature1'
git for-each-ref --format %(refname) %(objectname) --sort -committerdate
git remote --verbose

Issues:

1. Publish works. I can see my branch on server repo but I also get above error. After publish icon remains same.
   
2. Icon notifications stop working. I don't see any indication if there is any pending commit to push or pull latest changes.

I think it was working fine until 1.28 or 1.29

Note:
If I create branch with name like "feature1", everything works as expected.

Does this issue occur when all extensions are disabled?: Yes