When you go to your achievements in Minecraft, you see information such as the achievements, and how many achievements you have completed, and hours played.
But the hours played is somehow bugged out, and i can confirm this for several different players. In my case, hours played is stuck at 482, and will not change. However i am still earning achievements as usual. In the case of my friend, her hours played is 0. Despite the fact that she's been playing consistently. Another person, on his computer which he recently got Minecraft on, the hours played are 0, even though on his mobile device with the same xbox account the hours played are 386.

Steps to reproduce;
Look at hours played.
Write down the number.
Play for at least an hour/afk
Compare the times. They will be the same.