I saw in the release notes for the hotfix that there was a rare bug (fixed) that previously caused the player to become invulnerable. I thought it possible that the bug was still lurking. However, upon further troubleshooting, I realized that the problem was a PEBKAC problem. I did not know that the game would save the flags for God and Cloak in the admin panel. I had assumed that those were reset when exiting the game. Sorry for this false bug report.