Is this a known problem with this 4th gen Apple TV?
No, it is probably how the app is made by MLB, unrelated to your model device. Please consult with MLB about app feature availability.
Verify that your Apple TV system software is up-to-date, and that apps update automatically.
- Update your Apple TV - Apple Support
- Set up automatic updates or installation - Apple TV user guide - Apple Support
You may try this for any misbehaving app:
- Force-quit the app, then relaunch and try again.
- If the issue persists, force-quit the app, restart the device, then relaunch and try again.
- If the issue persists, delete the app, re-download and try again.
- If the issue still persists, then contact the app developer for further assistance.