That linked discussion doesn't say it is broken all the time (which your comment strongly implies to anyone who doesn't read the link)... and I had verified the parallax effect was working fine earlier today when I made my comment.

I hadn't rebooted my phone in quite awhile, so I'm not sure what the conditions are for that bug, but I think that discussion is wrong that rebooting is the only way to get it working again. I had surely accessed the App Library since the last reboot at some point, and yet parallax was working fine. But I can confirm that it does break (at least temporarily) after accessing the App Library.