TortoiseGitMerge can create empty lines without line break in some situations

What steps will reproduce the problem?

1. Create a new local Git repository
2. Create commit CommitA with file test.txt whose content is

   a
   
   test

3. Create commit CommitB1 changing test.txt's content to

   b1
   
   test

4. Create a new branch at CommitA and switch to it
5. Create commit CommitB2 changing test.txt's content to

   b2
   
   test

6. Try merging branch main (or master) into the current branch
   ℹ A merge conflict should occur
7. In the TortoiseGitMerge window in the "Merged" pane:
   1. Position your cursor behind the a
   2. Press Enter
   3. Press Del
      ℹ The editor content should now look like this:
      
8. Have a close look at the editor content
   ❌ Line 1 is missing a line break
9. Mark the file as resolved
10. Open the file with a third-party editor
    ❌ The text test is on line 2 instead of line 3 as it was shown by the TortoiseGitMerge window, that is, a line break is missing

What is the expected output? What do you see instead?

Expected: The line numbers and lines shown by TortoiseGitMerge match the actual result.

Actual: As shown by the reproduction steps, TortoiseGitMerge shows empty lines where there are in fact no empty lines in the actual result (due to missing line breaks).

What version of TortoiseGit and Git are you using? On what operating system?

TortoiseGit 2.12.0.0
git version 2.33.0.windows.2

Windows 10

Please provide any additional information below.

There might be multiple variants of this. I have had it at least two times that I removed a line break by accident this way when resolving merge conflicts.

Probably related to #3252 (closed).