Affects Version/s: Minecraft 15w45a, Minecraft 1.10.2, Minecraft 16w42a, Minecraft 1.11, Minecraft 1.11.2
Fix Version/s: Minecraft 1.12
If you have a large item tag (e.g. with multi line lore and enchantments) and it is hovered over in your inventory in a villager GUI, the villager's items for trade will be layered on top of the item tag.
1: Get an item with a very large tag, for example:
2: Go up to a villager and right click on him to open his GUI.
3: Hover over that large-tagged item in your inventory, once you're in the villager's GUI.
4: Voilà! If it goes up into where he requests his items, the item is layered in front of the text.