<blockquote>
<p>My default shell is zsh but I don't think that makes a difference here. sh is in /bin/sh and executable.</p>
</blockquote>
<p>Actually its possibly the problem if sh is just an alias for zsh, which says it emulates sh if started by that name, but how well that emulation is done I don't know.  Can you check what sh actually runs?</p>

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