As the launch date of Minecraft's major Tricky Trials update fast approaches, Mojang has consistently been releasing new test versions, some of which focus on bug fixes and minor changes. The Minecraft 1.21 snapshot 24w21a effectively improves overall smoothness and prevents crashes. The main highlights of this Java Edition snapshot include some minor sound changes to the piston and a few improvements to this title's multiplayer experience.This article will cover the detailed release notes for the 1.21 snapshot 24w21a update for Minecraft's Java Edition.Minecraft 1.21 snapshot 24w21a: Everything you need to knowMain changesThe piston sound has been reverted to the previous one. Here are all the main changes in this snapshot:It seems we cooked a bit too hard with the new Piston sounds last week, which is why we're reverting back to the old sounds againLowered volume of original sounds to address initial feedback of Pistons being too loudPause menu now can include a list of links provided by serverImprovements to the disconnection screenAny member of a Realm can now upgrade a worldIn the Realms main screen, all online players of a Realm are displayedWhen hovered, a tooltip is shown with each player's head and nameVaultsThe vaults in Minecraft 1.21 have received a quality of life change:Added sound effect to help players understand they've already looted a vaultTrial chambersA minor change has been made to the spawn location of the new trial chambers:Trial Chambers are less likely to generate in the Deep DarkAnimal panicAnimal mobs in Minecraft will now panic based on the sustained damage. Here's everything we know:Animals now panic based on the damage caused by predefined Damage Source TypesThe panic lasts for 2 seconds after the damage is dealt. The following damage type tags are used by vanilla animals:panic_environmental_causes: Used by Wolves, Polar Bears (adults) and Pandaspanic_causes: Used by all other animals and baby Polar BearsServer linksServers can now provide a list of links to clientsIf client has received any links, a new button called "Server Links..." will show up in pause game screenTo make space for that button, "Report Bugs" and "Give Feedback" buttons might be moved into a sub-screen if necessaryDisconnection screen improvementsIn some cases client will now store detailed information about disconnection (similar to crash reports)When that happens, new "Open Disconnection Report Directory" button will be added to the disconnection screenWhen server provides link for bug reporting, it will be also be added as a button to the disconnection screenFIXED BUGS IN 24W21AA couple of major bugs, including a six-year-old one, have been fixed in this Minecraft update. Here's a detailed list of the fixed issues:MC-67 - Entities with passengers cannot travel through portalsMC-31819 - Hunger saturation depletes on peaceful difficultyMC-116279 - Non-player entities going through Nether portal do not generate portal in Nether if none existsMC-151648 - Non-player entities cannot travel through unlinked nether portalsMC-170103 - Untamed wolves only beg for food while being angry and jumpingMC-260346 - Custom music discs cut off when vanilla disc would normally endMC-266290 - Double doors do not automatically form between waxed and unwaxed copper doors, even of the same variantMC-266586 - Trial chambers can spawn directly inside the deep dark biomeMC-266626 - Breeze doesn't stop attacking the player when it enters on the same teamMC-267967 - Breezes ignore the deflects_projectiles entity type tagMC-268438 - Baby armadillos can still eat while rolled upMC-269034 - Wolves no longer teleport while trying to pathfind out of LavaMC-269351 - The Bolt Armor Trim cannot be duplicated with Waxed Copper BlockMC-269370 - Sharp lag spike caused by incorrect upper limit on particles created by mace smash attackMC-269460 - Thorns enchantment doesn't work when entities are hit by wind chargesMC-269964 - Ominous item spawners are missing an NBT load for spawn_item_after_ticksMC-269988 - New potion effects don't apply their respective behaviors when creeper explodesMC-270024 - When drinking ominous bottles, bad omen of higher levels can be overriden by lower amplifiersMC-270377 - Wind charges can be hit and redirected the moment they are thrownMC-270573 - Mounted entities are immune to wind charge damageMC-270808 - Any item in the armor.body slot protects wolves from taking damageMC-271458 - Channeling tridents no longer summon lightning bolt every time hitting lightning rod under thunderstormMC-271573 - Attribute Enchantments Don't Behave Properly on ArmorMC-271634 - Custom enchantments don't appear in the creative menuMC-271718 - Crash when randomized_int_state_provider is applied to blocks lacking the propertyMC-271753 - Crash due to overflow inside cost calculation in by_cost_with_difficultyMC-271856 - Crossbows enchanted with Quick Charge do not benefit from its effects when used in the offhandMC-271868 - Frost walker replaces flowing water nowMC-271901 - Entity effect "play_sound" Field "pitch" value upper limit is 1.0 instead of 2.0MC-271911 - Frost walker no longer works with void or cave airMC-271914 - Soul speed enchantment doesn't emit particles when the entity is controlled by a playerMC-272039 - Soul Speed uses durability in creative modeMC-272042 - If players have max health over 20 and die, when they respawn they will have 20 health instead of their max healthMC-272043 - The game crashes when entities die while having the oozing effectMC-272075 - Attempting to step up while controlling entity and moving fast often glitchesMC-272084 - Creepers with potion effects no longer create area effect clouds upon explodingMC-272182 - Knowledge Books no longer function properly with a stack size of 1 in survival/adventure modeThat's all the notes on the bug fixes and changes. If you're interested, you can visit the link to the official Minecraft webpage embedded in the tweet provided earlier to learn about the technical changes made in this snapshot.