The bug

Advancement descriptions use title-case for generic material names unnecessarily, since they are in the middle of a sentence. For things like mobs or structures, since they refer to unique, game-specific elements, it's more than ok to use capital letters — for example, "Enter a Bastion Remnant". But using capitalization on generic, unspecific materials is a bit unusual, since there's nothing special about them.

Affected strings:

• Find Elytra^Fixed
• Form and mine a block of Obsidian ^Fixed
• Construct and place a Beacon (inconsistent with "Bring a beacon to full power")
• Obtain Crying Obsidian ^Intended
• Use a Compass on a Lodestone
• Ride a Strider with a Warped Fungus on a Stick ^Intended
• Get a full suite of Netherite armor ^Intended
• Change a Respawn Anchor to the maximum ^Intended
• Obtain Ancient Debris ^Intended

Archive (fixed in previous versions)

Capitalization required (game-specific elements):

• Obtain a wither skeleton's skull ^Fixed
• Respawn the ender dragon ^Fixed
• Weaken and then cure a zombie villager (capitalized in subtitles) ^Fixed

Capitalization required (title-case):

• Sniper duel ^Fixed
• Sweet dreams ^Fixed

Game element's names:

• Follow an Ender Eye (should be Eye of Ender) ^Fixed
• Enchant an item at an Enchanting Table (should be Enchantment Table) ^{Renamed "Enchantment Table" to "Enchanting Table" in 17w47a}