> Stash is used to record the current state of the working directory and index while also returning to a clean working state.

Er, no. Stash does not return to a clean working state. Stash stashes modifications, not new files. And it makes a real mess if those new files happen to exist on another branch you want to check out.

Stash seems like a half-implemented feature tbh, if only for the infuriating limitation above. It's really just not safe to use.