The (setf ...) part doesn't look right to me.

> [ Also did you get this with an Emacs which includes:
>
>     commit 8683d64cc571500347a16e7cb7d144d723250489
>     Author: Stefan Monnier <monnier@iro.umontreal.ca>
>     Date:   Thu Oct 3 10:25:13 2024 -0400
> ]

$ git show 8683d64cc571500347a16e7cb7d144d723250489
commit 8683d64cc571500347a16e7cb7d144d723250489
Author: Stefan Monnier <monnier@iro.umontreal.ca>
Date:   Thu Oct 3 10:25:13 2024 -0400

    (help--symbol-completion-table): Try and fix bug#73473

I'm runnig Emacs from master (ff4de9ef) on macOS.

> Sorry for not mentioning it earlier, I stupidly assumed you were aware
> of that variable.

I'm sorry I didn't investigate enough to find out about that variable
myself.

Best, Arash