From mboxrd@z Thu Jan  1 00:00:00 1970
From: Adam Porter <adam@alphapapa.net>
Subject: Re: Asynchronous org-agenda-redo
Date: Mon, 23 Dec 2019 18:36:09 -0600
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Ihor Radchenko <yantar92@gmail.com> writes:

> If you accidentally move the point in the buffer being processed by
> agenda, the results may be unpredictable (org-agenda-get-* functions
> move across the buffer with re-search-forward).

I'm afraid that's the basic problem with threading in Emacs: shared
state.  I don't know of a way to work around that.  I suppose you could
modify a lot of the agenda code to, e.g. store the position of the
current search in a variable and go to it before each search.  Of
course, that would also reduce performance to some extent.  It's a hard
problem.