Pausing the game not working correctly

I was playing on the new snapshot, when I pressed "esc" to do something else on internet. I didn't close the world where I was playing. The time stopped, as usual, but when I came back on the world the game decided to accelerate the time I spent and I saw the moon riing in 1/2 second, monsters walking at the speed of light, and the 2 minutes I spent on the internet happened in a few seconds.
I'm sorry if I don't speak perfectly english, I'm french