bug#59828: Fundamental Mode buffers fail to keep text properties

[Eli Zaretskii]

> Cc: 59828@debbugs.gnu.org
> Date: Mon, 05 Dec 2022 08:30:51 +0000
> From:  Heime via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> > > Have noticed that when I insert text with colour properties in a buffer
> > > using fundamental-mode, the text properties (e.g. colours) get lost.
> > 
> > 
> > I assume you used the ‘face property, right? If you replace ‘face with 
> > 'font-lock-face, does it work?
> > 
> > Yuan
> 
> I used 'font-lock-face and did not work.

Please show the code you used.  It works here.