You'll notice
Worktree safety check for the 'gitdir' pointer file was reworked to correctly detect unsafe relative paths
What
The routine that validates a worktree's gitdir pointer file, used to decide whether it's safe to treat as a real git directory, now normalizes the path relative to the repository's common directory before checking it for .. or . segments. This replaces a previous check that appeared buggy, since it searched the wrong variable (r) instead of the freshly-split path.
Why
This fixes a worktree safety check so that suspicious relative paths in a gitdir file (the kind git itself would not normally write) are properly detected, reducing the chance of treating an unsafe location as a legitimate git directory.