Why doesn't git core.eol=lf work?

[Jason Cho <jason11choca@xxxxxxxxx>]

```MINGW64 /tmp/summer-temp/dbeaver/docs ((e4219ccb38...))
$ git log -1 --patch license_header.txt
commit b5121d4a6e8f3f21079920180b0fb14ada6d3349
Author: serge-rider <serge@xxxxxxxxx>
Date:   Thu Jan 10 21:56:55 2019 +0300

    License header update (2019)

diff --git a/docs/license_header.txt b/docs/license_header.txt
index 86de505a18..d75b48e98e 100644
--- a/docs/license_header.txt
+++ b/docs/license_header.txt
@@ -1,5 +1,5 @@
    DBeaver - Universal Database Manager
-   Copyright (C) 2010-2018 Serge Rider (serge@xxxxxxxxx)
+   Copyright (C) 2010-2019 Serge Rider (serge@xxxxxxxxx)^M

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.

MINGW64 /tmp/summer-temp/dbeaver/docs ((a3f59b66ed...))
$ git check-attr --all -- license_header.txt

MINGW64 /tmp/summer-temp/dbeaver/docs ((a3f59b66ed...))
$ rm license_header.txt

MINGW64 /tmp/summer-temp/dbeaver/docs ((a3f59b66ed...))
$ git -c core.autocrlf=false -c core.eol=lf checkout -f HEAD -- license_header.txt

MINGW64 /tmp/summer-temp/dbeaver/docs ((a3f59b66ed...))
$ cat -A license_header.txt
   DBeaver - Universal Database Manager^M$
   Copyright (C) 2010-2019 Serge Rider (serge@xxxxxxxxx)^M$
^M$
   Licensed under the Apache License, Version 2.0 (the "License");^M$
   you may not use this file except in compliance with the License.^M$
   You may obtain a copy of the License at^M$

MINGW64 /tmp/summer-temp/dbeaver/docs ((a3f59b66ed...))
$ git --version
git version 2.47.0.windows.2
```

I ask git to force checkout license_header.txt with LF line ending, but `cat` tells me the file is checked out with CRLF. Why?