Some in-game UIs have different transparent black background. The one is darker and the another one was not completely dark.

List of affected UI

• Anvil
• Beacon
• Blast furnace
• Brewing stand
• Cartography table
• Chest and its varian (normal, trapped, and ender)
• Enchanting table
• Furnace
• Grindstone
• Inventory (affect all gamemodes)
• Loom
• Rideable entity with chest (boat with chests and its variant and minecart)
• Shulker box (both default and colored)
• Smoker
• Stonecutter
• Trading (villager and wandering trader)

Those lists are not darker than another UI. It should be change to match the dakrer transparent UI background (Darker screen dimming.PNG) or the transparent background in the new Ore UI one.