symlink already exists when adding non-ascii names

Please describe the problem.

In a large import, three files (all with non-ascii names) gave the following error: git-annex: .git/annex/othertmp/.0: createSymbolicLink: already exists (File exists)

I've tried to extract the relevant part of a strace -f:

mkdir(".git/annex/othertmp", 0777) = -1 EEXIST (File exists)
newfstatat(AT_FDCWD, ".git/annex/othertmp", {st_mode=S_IFDIR|0755, st_size=4096, ...}, 0) = 0
mkdir(".git/annex/othertmp", 0777) = -1 EEXIST (File exists)
newfstatat(AT_FDCWD, ".git/annex/othertmp", {st_mode=S_IFDIR|0755, st_size=4096, ...}, 0) = 0
mkdir(".git/annex/othertmp/.0", 0777) = 0
unlink(".git/annex/othertmp/.0") = -1 EISDIR (Is a directory)
symlink("../../../../../.git/annex/objects/9w/wJ/SHA256E-s5426861--cdc0664822c9df3ffbf255d160870fc39a6fdd1168b02fc2c9b59cc65bc81c26.pdf/SHA256E-s5426861
--cdc0664822c9df3ffbf255d160870fc39a6fdd1168b02fc2c9b59cc65bc81c26.pdf", ".git/annex/othertmp/.0") = -1 EEXIST (File exists)
newfstatat(AT_FDCWD, ".git/annex/othertmp/.0", {st_mode=S_IFDIR|0755, st_size=4096, ...}, 0) = 0
newfstatat(AT_FDCWD, ".git/annex/othertmp/.0", {st_mode=S_IFDIR|0755, st_size=4096, ...}, AT_SYMLINK_NOFOLLOW) = 0
openat(AT_FDCWD, ".git/annex/othertmp/.0", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 31
fstat(31, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
getdents64(31, 0x7f2694001180 /* 2 entries */, 32768) = 48
getdents64(31, 0x7f2694001180 /* 0 entries */, 32768) = 0
close(31)                  = 0
rmdir(".git/annex/othertmp/.0") = 0
close(26)                  = 0

What steps will reproduce the problem?

touch "墨漬 Ink Stains.pdf"
git annex add "墨漬 Ink Stains.pdf"

(the file name base64 encoded is 5aKo5rysIEluayBTdGFpbnMucGRm)

What version of git-annex are you using? On what operating system?

git-annex version: 10.20250605-gd2dc318a867f571cbc848b5d45e82e153e364e4e
build flags: Assistant Webapp Pairing Inotify DBus DesktopNotify TorrentParser MagicMime Benchmark Feeds Testsuite S3 WebDAV
dependency versions: aws-0.24 bloomfilter-2.0.1.2 crypton-1.0.0 DAV-1.3.4 feed-1.3.2.1 ghc-9.4.8 http-client-0.7.18 persistent-sqlite-2.13.1.0 torrent-10000.1.3 uuid-1.3.16 yesod-1.6.2.1

I'm running Arch Linux (kernel 6.15.1-arch1-2). The repo I'm running the commands in is on an ext4 filesystem.

Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)

git-annex has been brilliant for managing my large media collection across several removable drives, and I'm confident it will continue to scale. This is the first issue I've run into with it.