2a8fdfc7d (Display a warning message when asked to operate on a file inside a directory that's a symbolic link to elsewhere, 2020-05-11) made git annex add error like git add does rather than silently doing nothing in a scenario like below.

# <repo>
# |-- a
# |   `-- f0
# `-- alink -> a
cd "$(mktemp -d "${TMPDIR:-/tmp}"/gx-link-XXXXXXX)"
git init && git annex init
mkdir a
ln -sT a alink
echo 0 >alink/f0
git annex add alink/f0

Unlike git, however, git-annex's warning also applies when the symbolic link is upstream of the repository and git-annex is passed an absolute path.

# .
# |-- a
# |   `-- repo
# |       `-- f0
# `-- alink -> a
cd "$(mktemp -d "${TMPDIR:-/tmp}"/gx-link-XXXXXXX)"
mkdir a
ln -sT a alink
git init alink/repo
(
    cd alink/repo
    git annex init
    echo 0 >f0
    git annex add "$(pwd)"/f0
)
[...]
git-annex: /tmp/gx-link-Wxqnzo8/alink/repo/f0 is beyond a symbolic link
add f0
ok
(recording state in git...)

The file does appear to be annexed and added to the index despite the warning:

$ git diff --cached
diff --git a/f0 b/f0
new file mode 120000
index 0000000..7a725b9
--- /dev/null
+++ b/f0
@@ -0,0 +1 @@
+.git/annex/objects/Xj/V5/SHA256E-s2--9a271f2a916b0b6ee6cecb2426f0b3206ef074578be55d9bc94f6f3fe3ab86aa/SHA256E-s2--9a271f2a916b0b6ee6cecb2426f0b3206ef074578be55d9bc94f6f3fe3ab86aa
\ No newline at end of file

Looking at Seek.workTreeItems', my first thought was that the above scenario should not error: relPathCwdToFile should turn the absolute path into f0 when it compares it against the current working directory, /tmp/gx-link-Wxqnzo8/alink/repo/. However, it looks like System.Directory.getCurrentDirectory returns a resolved path for the current working directory, so relPathCwdToFile turns the absolute path into ../../alink/repo/f0, which gets flagged by the viasymlink check.

This error message is of course easy enough to work around on the caller's side, but since it looks like an unintended consequence of 2a8fdfc7d, the change in behavior seems worth mentioning.