A bunch of item and block names are outdated when compared to Java Edition, and/or are inconsistent with other Bedrock item names or item IDs. In previous updates, some names were updated to match Java Edition, but most of them still need to be fixed. Following the changes to item IDs in 1.16.100, displayed names should also be updated.

• "Brick+s+ Slab", "Stone Brick+s+ Slab" and "Prismarine Brick+s+ Slab" are grammatically incorrect and inconsistent with their stairs form and other brick-type slabs
• "Brick Block" is inconsistent with other brick-type blocks (e.g. "Stone Bricks", "Blackstone Bricks", "Prismarine Bricks")
• "Nether Brick Block" is inconsistent with other brick-type blocks and its variants ("Chiseled Nether Bricks", "Cracked Nether Bricks")
• "Red Nether Brick" should be plural like other brick-type blocks
• "Pillar Quartz Block" is inconsistent with "Purpur Pillar" and harder to translate than the much simplier "Quartz Pillar"
• "Clay Block" is inconsistent with other soil-type natural blocks such as sand or gravel
• The "Clay" item should then be renamed in order to avoid having the same name for multiple items, and "Clay Ball" would be consistent with the item's ID
• "Snow" should include "Block" in its name in order to be consistent with other manufactured blocks
• "Top Snow" could then be renamed to the much simplier "Snow"
• "Grass" has been changed to "Short Grass" in Java 1.20.3-pre1 (MCPE-177051)
• "Double Tallgrass" is a weird name as there's no regular "Tallgrass" and "Tallgrass" itself is grammatically incorrect
• "Seeds" is inconsistent with every other seed item
• "Enchanted Apple" is inconsistent with the regular "Golden Apple" and its new ID
• "Melon" item should be differentiated from the "Melon" block and it's inconsistent with the new item ID
• "Glistering Melon" is inconsistent with the new item ID
• "Mushroom" is a generic name, see MCPE-71117
• "Infested Stone Brick" and variants should be plural like the regular "Stone Brick+s+"
• "Head" is a generic name, the block specifically refers to a player's head
• "Enchantment Table" is inconsistent with the block ID
• "Daylight Sensor" is inconsistent with the block ID
• "Wooden Slab" refers to the old unused stone-like oak slab. Even though it's unused and unavailable in the creative inventory, its name should be updated as the new name better describes the block
• "Sea Turtle", used in the egg and the spawn egg item names, is inconsistent with the IDs of the two items, the turtle entity name and ID, the new "turtle scute" item name, and arguably with the "potion of the turtle master" item name.

Additional items might be included in the list at https://minecraft.wiki/w/Minecraft_Wiki:Bedrock_Edition_flattening#Names