In reply to @maxb0tbeep "the directory changes back": think of it this way -
each process has its own entry in the process table, cwd, which says what the
process' working directory is. there is no way for another process to change
that entry at runtime

(you could of course inject code into the target process via ptrace or gdb that
calls `chdir`, but... I'm not even sure how far that would get you, since most
programs cache the cwd in order to avoid useless syscalls, since they assume
that it can't just change nilly-willy - an expectation you'd be breaking)