Bug Report or Unexpected Feature when "git restore -m ." restores merge conflicted state of a file after a commit

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

Can be replicated on a new repository.

1. Initialize git repo.
    git init
2. Create a file
    touch test-file
3. Write to the file
    "update 1"
4. Stage the changes to the file, create a commit.
    git add .
    git commit -m "update 1"
5. Copy the branch
    git branch -c "main-copy"
6. Write to the file on the same first "main" branch by appending new
content on the second line of the "test-file"
    "update 2"
   The file looks like:
    "update 1"
    "update 2"
7. Stage and commit.
    git commit -a -m "update 2"
8. Introduce another change to the file but keep it on the work-space
by appending another line
    "update 3"
   The file looks like:
    "update 1"
    "update 2"
    "update 3"
9. Make a merge switch
    git switch --merge main-copy
   The file on the "main-copy" branch should look like:
     "update 1"
     "<<<<<<< main-copy"
     "======="
     "update 2"
     "update 3"
     ">>>>>>> local"
10. Stage and commit file
    git commit -a -m "merge conflict on main-copy"
11. Restore merge-conflicted state
    git restore -m .

What did you expect to happen? (Expected behavior) The "git restore -m ." is not supposed to restore the merge-conflicted state of the file after it was staged and committed

What happened instead? (Actual behavior) The "git restore -m ." restored the merge-conflicted state of the file after it was staged and committed

What's different between what you expected and what actually happened? The restoration of the merge-conflicted state of the file after it was staged and committed

Anything else you want to add: I am not sure whether it is a bug or a feature but the behavior seemed unexpected and I couldn't find any mentions of it.

[System Info] git version: git version 2.34.1 cpu: x86_64 no commit associated with this build sizeof-long: 8 sizeof-size_t: 8 shell-path: /bin/sh uname: Linux 6.8.0-57-generic #59~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Wed Mar 19 17:07:41 UTC 2 x86_64 compiler info: gnuc: 11.4 libc info: glibc: 2.35 $SHELL (typically, interactive shell): /bin/bash

[Enabled Hooks] not run from a git repository - no hooks to show