Hey there Tiseppi,
I'm sorry to hear your having issues casting those two apps! I can imagine this issue is quite frustrating, so I'd be happy to help out. First, I would clear out the cached app data for the Google Home, Netflix and Paramount+ apps. If that doesn't resolve it, try casting those apps from another device, such as a phone or tablet, to see if the problem persists.
I look forward to your response, and if you have any other questions or concerns for me, please let me know!