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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Edebug corrupting point in buffers; we need buffer-point and
 set-buffer-point, perhaps.
Date: Mon, 31 Oct 2022 15:16:28 +0200
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To: Alan Mackenzie <acm@muc.de>
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In-Reply-To: <Y1+00x9hKKFpAVO6@ACM> (message from Alan Mackenzie on Mon, 31
 Oct 2022 11:43:15 +0000)
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> Date: Mon, 31 Oct 2022 11:43:15 +0000
> From: Alan Mackenzie <acm@muc.de>
> 
> A few weeks ago, I was attempting to edebug a program which itself
> scanned through a buffer B.  That buffer was also displayed in a window
> (or possibly two windows).  Each time the program went into edebug, the
> point in B got corrupted.
> 
> Setting edebug-save-displayed-buffer-points didn't help.

Did you try switch-to-buffer-preserve-window-point?