Just downloaded the new snapshot and discovered this issue.

It's easy to reproduce

1. Open the new snapshot
2. Open a Singleplayer World
3. Take items with more than 1
4. Slide the cursor over your item slots
--> The number of items will always show above the text

Multiplayer Server Navigation:
1. Click on Multiplayer Box
2. Add a bunch of server with colored text in the description. (hive.mc, 2b2t, mineplex, etc.)
3. Scroll down
4. You'll see text losing his color and appearing on the grey buttons as brown.

Click here to see the demonstration video