Put the summary of the bug you're having here

*What I expected to happen was...: Nothing out of the ordinary, I expected the game to run as normal. *
Describe what you thought should happen here

What actually happened was...: I selected oak saplings in my hotbar and all the textures disappeared, some from my inventory and all from the world apart from mobs. The world was fine before-hand but as soon as they was selected, it all broke! After the bug is triggered, if the oak saplings aren't selected then lava and water can still be seen. If they are selected then lava and water flicker.

Describe what happened here

Steps to Reproduce:
1. Video settings are as follows:
Graphics: Fast
Render Distance: 12 chunks
Mipmap Levels: 4
Anisotropic Filtering: Off
(Other settings have not been changed)

2. Inventory is as follows:
First four slots of hotbar:
1 apple, 2 seeds, 15 Oak saplings, 10 Birch wood, 1 Birch sapling, blank, blank, blank, Crafting table.

Top line of inventory, on the third slot from left, 14 oak wood.

3. ...Was playing in full screen at the time and using Tiny Pixel's 8x8 texture pack