The Title says all.

Then you open for example Chest, Double Chest, Furnace, Minecatf with Chest / Furnace / Hopper, Hopper, Enderchest, ect. (Almost all Container GUI-s) the "Gray / Darken Background" don't show. (Like in the Inventory and Creative Inventory. There it's shown normally).

The Items Tooltip / Text / Title / Name / Enchants, ect. Don't show up too in this specific conditions.

Screenshots Uploaded for more convenience;

P.S. *Nevermind... I see another issue with Item Text / Tooltips bug reported before me now. BUT this issue also contains Gray / Dark Background buggy, not only Item Names / Enchantments.