git mvで大文字を含むディレクトリ名を変更できない

cd ~
mkdir repo && cd repo
git init
mkdir Capital
echo "hogehoge" -> Capital/Hoge.txt
git add .
git commit -m "first commit"

repo
└── Capital \\大文字ディレクトリ
    └── Hoge.txt \\大文字textファイル

git mv Capital/Hoge.txt Capital/hoge.txt

repo
└── Capital
    └── hoge.txt

git commit -m "renamed Hoge.txt to hoge.txt"

git mv Capital/ lowercase/

fatal: renaming 'Capital' failed: Invalid argument

   mkdir tmp

   git mv Capital/* tmp/

   repo
   ├── Capital
   └── tmp
       └── hoge.txt

   rm -r Capital

   git mv tmp lowercase

   git commit -m "renamed Capital to lowercase"

   repo
   └── lowercase
       └── hoge.txt

❯ git show
commit 585776e1411a08f42aab249f37cd008882f19b0c (HEAD -> master)
Author: hoge
Date:   hoge

    renamed Capital to lowercase

diff --git a/Capital/hoge.txt b/lowercase/hoge.txt
similarity index 100%
rename from Capital/hoge.txt
rename to lowercase/hoge.txt

git mv Capital/ lowercase/