If owntone crashes, the container remains running. Since openrc is the main container process, owntone can terminate from an error and openrc will continue to run and the container will not stop or restart.
Running applications under containers should be self healing. If a crash happens that can be recovered with a restart, then the container should recover itself.
With things as they are, owntone could crash and the container would continue to run as if it was still healthy.