The Lunge enchantment now works at 6 hunger and above, instead of 7

The "display" field on Attribute Modifiers is not optional, despite the changelog saying it is

Re-scaled Parrots revert to their normal size when sitting on a player's shoulder

Adding effects with an effects_changed advancement causes a packet error (ConcurrentModificationException) if it was triggered by Milk

"projectile_spawned" Enchantment Component runs predicates and effects on projectiles before all of their data has been assigned

Potion Effects can no longer be hidden via "show_in_tooltip" or the "toggle_tooltips" function

Knowledge Books no longer function properly with a stack size of 1 in survival/adventure mode

"projectile_spawned" Enchantment component triggers the enchantment effects BEFORE setting the projectile's default NBT

"hit_block" Enchantment component doesn't provide the Dimension context when calling "run_function"

Adding "match_tool" conditions to the gameplay/fishing/fish loot table prints server errors, but the loot table still works

Custom NBT fields with "." in their name are inaccessible to data paths

"/execute if function" cannot be run without further subcommands

Attribute entity_interaction_range is classified as 'generic', but has no effect on mobs

Trident "damage" NBT field seems to do nothing

Deepslate Ores generate at surface level within Custom Structures

Using /spectate on a Marker entity still allows the player to move around

Wardens summoned with any NBT data (including an empty {} object) will immediately dig and despawn

Decorated pots from the creative inventory and new blank decorated pots with no NBT will match their texture to the last decorated pot you crafted

1.17 Server Immediately Throws an Exception on Startup

Command Block's last output (in the block interface) displays an outdated result

Partly-damaged Iron Golems have holes in their texture that show up in the Glowing effect

follow_range attribute seemingly has no effect on Phantoms

Extreme lag when loading chunks

Custom Items created through Loot Tables are "incompatible" (can't stack) with the exact same item created through commands

Lingering Potions created with the CustomPotionEffects tag show incorrect effect time in tooltip

naturalRegeneration can disable to Regen status effect

Command Blocks Not Triggered by Weak Redstone

Zombies stop attacking villagers that are frozen in place

Nametags not keeping mobs from despawning

Ghost items in 1.7