Thanks for your suggestion John, I did try this and it did work, so 
apologies. I realised it had to be something to do with our build script. 
We have it working now so many thanks for everyone with their help.

On Friday, 21 January 2022 at 19:37:53 UTC John MacFarlane wrote:

>
> > description: |
> > Some long, perhaps multi-line description.
> >
> > Sadly this *does not* appear in the epub (2) metadata when we build it, 
> it 
> > used to work. This does seem like some sort of bug? Because if we use 
> > commas to surround the description text or use '>-' as suggested by 
> > Albert, the description *does* appear in the epub metadata. However, we 
> > have a lot of markdown which use the '|' formatting for multi-line so 
> I'd 
> > rather not have to change this is I don't have to.
>
> It works fine when I try it...
>
> If you want us to look into it, upload a minimal markdown
> source and exact command (and pandoc version) you used,
> together with the resulting epub.
>

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