Public Share links not available

I have a self hosted instance od Nextcloud which has worked great.
Since the recent update though, I have noticed that the when I access the nextcloud folder via my desktop, When I right click a document, select nextcloud, where I would usually see Copy public link I am now seeing resharing is not allowed

The other thing is, this s not all the time, some files which are saved allows me to copy the public link, others dont, I then need to copy the internal link and create a share link from the server.

I have checked the settings and sharing should be allowed by default.