bug#39529: 28.0.50; Metahelp does not contain help text

[Eli Zaretskii]

> From: Federico Tedin <federicotedin@gmail.com>
> Date: Sun, 09 Feb 2020 20:06:40 +0100
> 
> On Emacs 28.0.50 (5e7bead8ea), typing C-h C-h will display the
> *Metahelp* buffer, but instead of containing the usual help information,
> it will contain just the following:
> 
> Automatically break line at a previous space, in insertion of text.

It's related to dumping in some way, because in temacs this works as
expected.