git branch -d doesn't seem to delete branch/worktree from git cache

[lu0]

Describe the bug
Title

To Reproduce
Steps to reproduce the behavior:

1. Run git branch -d old_branch or git branch -D old_branch from git root or from the worktree directory.
2. This doesn't seem to delete the branch and worktree from the git cache, doing git checkout old_branch re-creates the worktree directory with the files of the 'deleted' branch.

Expected behavior
git checkout old_branch should raise an error after such branch has been deleted.

Screenshots
N/A

Desktop (please complete the following information):

• OS: Linux Mint 20, but tested on Windows 10 and Windows 11, too.
• Git version: 2.25.1
• Shell: Bash 5.0.16
• Repository version: v1.1.0

Additional context
git branch -d/-D old_branch does indeed delete the worktree directory, but it's kept in the cache.

[lu0]

Expected behavior

git checkout old_branch should raise an error after such branch has been deleted.

It does tho?

Can't reproduce on a clean, recently-cloned, bare repo. Need to test this thoroughly on another one.