Now that I think about it I also can't use the wake on LAN feature of my PC any more so there's something wrong with the internal routing of my devices. The devices are NOT isolated in the Deco app either

  @Wrayman 

Hi, Thank you very much for the feedback.

If the smart TV could still access the Plex server, It's hardly like to be the issue of Deco. Where did you deploy the Plex server, on the PC?

Would there be any error message on the PS5 when it failed to access the Plex server?

As for "use the wake on LAN feature of my PC", do you plan to wake PC over local network only?  Since Deco doesn't support IP&MAC binding, it can't be used for wake over WAN connection.

Best regards.