This issue happens with Web Version 4.76.1 and does not happen with Version 4.69.1.
From within a TV Library (not home hub) go to the recommended tab using https://app.plex.tv. The top item on the list is Continue Watching which is clickable. If you select this it should bring you to a page with a list of the CW items.
However, with version 4.76.1 this is now broke …
If you use the embedded client version at http://<your local ip>:32400/web it works perfectly.
I use this a lot due to the one on the home hub not being clickable.