Lockscreen bug

I went to go do something and locked my screen and came back and unlocked it and screen was frozen. I had to go to home screen and then restart my phone

I expected that after I unlocked I could play it
It should've worked - started with all beta builds.

It didn't let me play until I restarted my phone (not even closing the app helped)

Steps to Reproduce:
1... Lock the screen
2. ... Unlock screen
3. ...