AFK Blackness

Hello again mojang. i have another bug for you! so i was on my server, and i was afk for a couple of minutes to check something on the internet, and when i looked back i saw i was standing in complete darkness! and not the normal darkness! i mean like i could see the void and it looked like i was glitching into, like, the world! then i moved and it whent away! i dont know what this is but i hope you find out! from your biggist fan since 2009, Ethan Rempel