'git rev-parse --show-toplevel' errors out with per-worktree configs

Hello,

I have a bare repository clone that I create worktrees off. This works fine, including 'git rev-parse --show-toplevel'.

I enabled per-worktree configs using 'git config --local extensions.worktreeconfig=true', and now I can't get the toplevel anymore:

fatal: this operation must be run in a work tree

Disabling per-worktree configs makes it work again. This also works fine on a non-bare repository clone.

IOW, this works: git clone <url> non-bare (cd non-bare && git worktree add -b master2 ../wtree1 master) (cd wtree1 && git rev-parse --show-toplevel)

This does not: git clone -c extensions.worktreeConfig=true <url> bare.git (cd bare.git && git worktree add -b master2 ../wtree2 master) (cd wtree2 && git rev-parse --show-toplevel)

Is this a bug, or am I missing something?

Thanks,

Clément