$ gh pr create  
? Where should we push the 'dep/bump_matplotlib_3.6.0' branch? <origin>
error checking for existing pull request: no remote for "neutrinoceros:<branch_name>@{push}" found in "upstream, origin"

$ git push --set-upstream origin <branch_name>
$ gh pr create                                           
error checking for existing pull request: no remote for "neutrinoceros:<branch_name>@{push}" found in "upstream, origin"

$ git clone git@github.com:neutrinoceros/cli.git
$ cd cli
$ git remote add upstream https://github.com/cli/cli
$ git switch -c testbranch
$ echo "hello world" > testfile.txt
$ git add testfile.txt
$ git commit -am "test commit"
$ gh repo set-default
<cli/cli>
$ gh pr create
? Where should we push the 'testbranch' branch? neutrinoceros/cli
error checking for existing pull request: no remote for "neutrinoceros:testbranch@{push}" found in "upstream, origin"

$ GH_DEBUG=true gh pr create
[git remote -v]
[git config --get-regexp ^remote\..*\.gh-resolved$]
* Request at 2025-01-31 10:53:57.39598 +0100 CET m=+0.125380751
* Request to https://api.github.com/graphql
* Request took 389.563792ms
[git symbolic-ref --quiet HEAD]
[git status --porcelain]
[git config --get-regexp ^branch\.testbranch\.(remote|merge|pushremote|gh-merge-base)$]
[git show-ref --verify -- HEAD refs/remotes/upstream/testbranch refs/remotes/origin/testbranch]
* Request at 2025-01-31 10:53:57.858646 +0100 CET m=+0.588045959
* Request to https://api.github.com/graphql
* Request took 348.268709ms
* Request at 2025-01-31 10:53:58.241026 +0100 CET m=+0.970424584
* Request to https://api.github.com/graphql
* Request took 203.035125ms
? Where should we push the 'testbranch' branch? neutrinoceros/cli
[git -c log.ShowSignature=false log --pretty=format:%H%x00%s%x00%b%x00 --cherry upstream/trunk...testbranch]
[git remote -v]
[git config --get-regexp ^remote\..*\.gh-resolved$]
[git config --get-regexp ^branch\.neutrinoceros:testbranch\.(remote|merge|pushremote|gh-merge-base)$]
[git remote -v]
⣾[git config --get-regexp ^remote\..*\.gh-resolved$]
[git config push.default]
[git rev-parse --abbrev-ref neutrinoceros:testbranch@{push}]
[git config remote.pushDefault]
error checking for existing pull request: no remote for "neutrinoceros:testbranch@{push}" found in "upstream, origin"