Git rebase no longer defaults to upstream after force push

Thank you for filling out a Git bug report! Please answer the following questions to help us understand your issue.

What did you do before the bug happened? (Steps to reproduce your issue)

  git init --bare foo.git && git clone foo.git/ foo && cd foo
  touch bar && git add bar && git commit -m init
  git push -u
  git switch -c a
  seq 1 3 > bar && git add bar && git commit -m 1
  git push
  seq 11 13 > bar && git add bar && git commit -m 2
  git rebase -ir # Works like git rebase -ir @{upstream}
  git push --force origin main:a
  git rebase -ir # No longer works like git rebase -ir @{upstream}

What did you expect to happen? (Expected behavior)

After force pushing, I still expected the rebase to work like git rebase -ir @{upstream}.

What happened instead? (Actual behavior)

The rebase defaults to a commit other than that of the tip of the upstream branch.

What's different between what you expected and what actually happened?

Instead of behaving like git rebase @{upstream}, the rebase seems to default to rebasing on-top of the old upstream.

git rebase -ir result in a todo like this:

l onto

t onto p f1cfbff 2023-04-18 2

Compared to git rebase -ir @{upstream} which results in a todo like this:

l onto

t onto p 01e3c92 2023-04-18 1 p f1cfbff 2023-04-18 2

Anything else you want to add:

Please review the rest of the bug report below. You can delete any lines you don't wish to share.

[System Info] git version: git version 2.40.0 cpu: x86_64 no commit associated with this build sizeof-long: 8 sizeof-size_t: 8 shell-path: /bin/sh uname: Linux 5.15.90.1-microsoft-standard-WSL2 #1 SMP Fri Jan 27 02:56:13 UTC 2023 x86_64 compiler info: gnuc: 11.3 libc info: glibc: 2.35 $SHELL (typically, interactive shell): /bin/bash

[Enabled Hooks]