SharePoint Online List views not appearing in the List Web part

Hi

I'm hoping someone could help me with a problem I have just hit within SharePoint Online relating to List views (this includes custom list views) no appearing in the List webpart drop down for selecting the web parts source.

This was working fine but I created a new communication site which I was intending to make a site template out of, I populated the Document list with some test files then created a custom view saving it as Template List :

I then create a page within the site to house the template list via the webpart list view. I add the List web part but then when I select it to do the configuration the List drop down is empty :

I have created creating a second document library and adding some test files to it then creating a custom view in that document library on the same site but this wont appear either.

At first I thought it might of just been a badly created communication site but a site I made months ago also has this same issue.

Any guidance or setting to check to resolves this would be greatly appreciated.

Cheers;

Neil