Recent correspondence for a consequent GNU emacs bug report:
----- Forwarded message from Glenn Morris <rgm@gnu.org> -----
Date: Tue, 27 Nov 2018 00:56:29 -0500
From: Glenn Morris <rgm@gnu.org>
To: Boruch Baum <boruch_baum@gmx.com>
Cc: 33219@debbugs.gnu.org
Subject: Re: bug#33219: 25.2; crontab -e doesn't connect to existing emacs daemon
User-Agent: Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/)
differently.
For example, perhaps "crontab -e" does not pass TMPDIR to the spawned editor:
https://bugs.debian.org/19237
I verified by doing:
M-: (getenv "TMPDIR")
in the Emacs spawned by crontab that this is indeed the case.
So yes, I think it is a crontab issue.
----- End forwarded message -----