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        Sun, 21 Aug 2016 23:17:25 -0700 (PDT)
Date: Mon, 22 Aug 2016 07:17:23 +0100
From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: Zsh hackers list <zsh-workers@zsh.org>
Subject: [bug] $SHLVL decremented for the last command of a subshell
Message-ID: <20160822061723.GA7308@chaz.gmail.com>
Mail-Followup-To: Zsh hackers list <zsh-workers@zsh.org>
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(from https://unix.stackexchange.com/questions/304917/detect-when-zsh-is-running-within-the-subshell-of-another-shell)

$ printenv SHLVL
1
$ (printenv SHLVL)
0
$ (printenv SHLVL;:)
1
$ (:;printenv SHLVL)
0


http://www.zsh.org/mla/workers/1999/msg02472.html
sounds like a potential culprit.

-- 
Stephane