Still having different pwd for different windows

I posted previously about the fact that pwd returns different
directories for different windows. I was pointed to autochdir, in
particular:

verbose set autochdir?

which always returns noautochdir.

I already have noautochdir in my vimrc, and the above command
indicates that netrw was last to set the autochdir option.

The problem is sporadic enough that it isn't clear to me that I will
ever be able to figure out how/when autochdir is being set (if it is).

As an alternative to tracking this down, is there a way to prevent
autochdir from being set at all? I mean even if a plugin or function
somehwere issues a command to set autochdir, I want [g]vim to be
incapable of complying.

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