commit following rebase has unexpected commit message

[Victor Gambier <vgambier@excilys.com>]

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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 switch -c first
git switch -c second
[modify a file]
git commit -am "foo"
git switch first
[modify the same file in a conflicting way]
git commit -am "bar"
git rebase second
git restore --staged .
git restore .
git rebase --continue
[modify any file - can be the same file again]
git commit -a

What did you expect to happen? (Expected behavior)

The text editor should pop up and the first line should be blank (no default commit message).

What happened instead? (Actual behavior)

The text editor pops up, and the first four lines of the default commit message seem to pertain to the rebase:

	bar
	
	# Conflicts:
	#	frontend/src/styling/rounds.ts
	
Even though the contents of the commit correctly pertain to the very last changes and are unrelated to the rebase.

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

The default commit message.

Anything else you want to add:

A second anomaly is that if you replace the last command with git commit -a --no-edit, the two lines starting with '#' are NOT ignored and will be present in the final commit message.

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 2.30.0.windows.2
cpu: x86_64
built from commit: f8cbc844b81bf6b9e72178bbe891a86c8bf5e9e7
sizeof-long: 4
sizeof-size_t: 8
shell-path: /bin/sh
uname: Windows 10.0 18363 
compiler info: gnuc: 10.2
libc info: no libc information available
$SHELL (typically, interactive shell): C:\Program Files\Git\usr\bin\bash.exe


[Enabled Hooks]