For worktree, what does this mean (in the docs)? > Multiple checkout in general is still experimental, and the support for submodules is incomplete. It is NOT

For worktree, what does this mean (in the docs)? > Multiple checkout in general is still experimental, and the support for submodules is incomplete. It is NOT recommended to make multiple checkouts of a superproject. I'm not quite sure what is safe and what is risky.