Apple TV Paid Channels Prompt to Open in App

Apple TV offers additional channels. For example Paramount+ and Showtime.

This means that the programming is available via the channel within the Apple TV app.

From time to time, when you are within the channel (within the AppleTV app) and you select a program (ex 60 mins, ex The Daily Show, etc), it prompts you to open it in the Paramount+ App.

Why does this happen and when will Apple fix it?