QGO wasn't uninstalled or reinstalled. It has remain installed on my Quest 3 since I installed it earlier this year. There was a new v81 OS update that auto installed on my device at least two days ago. However, the playtime was showing up fine after the update. I only started seeing issues yesterday, at least a day or so after the v81 update. If I open up QGO and look at the total playtimes for the games/apps there, they are still show the correct values. When I open up some apps/games today and checked the playtime history with the Playtime VR app, I notice that the total time is now the sum of today's and yesterday's playtime.