subtle bug in git-am

Hi!

What I would like to do is to apply patch from one repository to another with same files but *different directory structure*.

When I try to change directory in the target repo to the folder of files, I run git-am -p5 my_cool_patch.patch.

Instead of the expected result (files and their contents is the same!) I got fileXXX is not in index.

So, I think this is a bug, because -p<n> use in git-am makes little to no sense without above feature.

Perhaps I didn't understand something. Please, advise.

$ git version git version 2.25.1