Hytale Update 6 Breaking Changes: The hytale/3 Protocol Migration Guide for Servers

Most of what shipped in the Update 6 Part 1 pre-release on May 28, 2026 is the kind of thing you can adopt at your leisure. One change is not. The network protocol jumped from hytale/2 to hytale/3, and the official patch notes are blunt about what that means: "Clients and servers on the previous protocol version will be unable to connect." There is no graceful fallback, no compatibility shim, no overlap window where old and new coexist. The day your players update their client, your server has to be on hytale/3 — or it goes dark for everyone. This is the migration guide for that reality. If you run a live Hytale server or write server-side mods, the rest of the build is upside; this one breaking change is the thing you schedule around. Below is the plan: why old and new cannot mix, the plugin and Hytale modding API changes you must rebuild for, the anti-cheat hardening you get for free, and a step-by-step cutover checklist. For the full feature rundown, our Update 6 Part 1 patch notes recap is the companion piece to this how-to. The hytale/3 Protocol Bump: Why Old and New Can't Mix A protocol version is the contract two machines agree on before they exchange a single packet of game state. When Hypixel Studios bumps it from hytale/2 to hytale/3, they are declaring that the wire format changed in a way the old contract can no longer parse. The handshake fails by design. That is why the studio added a new Crash = 7 QuicApplicationErrorCode in this build — it exists specifically to surface a protocol-version mismatch instead of letting the connection die with a vague timeout. Here is the practical shape of the Hytale breaking changes in front of you. An out-of-date server rejects updated clients: a player who patched to Update 6 tries to join your hytale/2 server and bounces off with the Crash = 7 code. The reverse is equally true — an updated client cannot join an old server, and a player still on the previous version cannot reach a server that has already moved to hytale/3. There is no version in which a mixed fleet works. The cutover is atomic, and it has to be planned that way. For a Hytale server owner, the takeaway is a scheduling problem, not a code problem. You cannot stagger this. You pick a window, you move the server binary to the Update 6 build, and your community updates their clients in the same window. Announce it ahead of time, because the failure mode for players who skip the memo is "the server is broken" — when in reality they are simply one protocol version behind. A clear pinned message ("we move to hytale/3 at 18:00 UTC Saturday, update your client first") saves you a flood of false outage reports. The Plugin & Modding API Changes You Must Rebuild For The protocol bump is the blocker; the API changes are the work. If you ship server-side mods, do not push the Update 6 build to production until you have rebuilt and tested against the new surface. Here is everything that moved, with the Hytale plugin migration action for each. Plugin accessor rename. BedsPlugin#getInstance() is now BedsPlugin#get(). This aligns it with the accessor convention already used across Universe, NPCPlugin, FarmingPlugin, and ObjectivePlugin. Any plugin still calling getInstance() will fail to compile or resolve against the new build — grep your codebase for the old call and swap it. New cross-world transfer API. Universe#transferPlayerAsync() has been added to centralise the "remove from world → await target world → addPlayer" pattern. If you run a multi-world network and have been hand-rolling that sequence, this is now the sanctioned path. Migrate onto it — it is more robust than the bespoke logic most networks were maintaining, and it is the API the studio will support going forward. Chunk-access deprecations. World#getChunkIfInMemory, getChunkIfLoaded, getChunkIfNonTicking, getChunkAsync, and getNonTickingChunkAsync are all deprecated. The new model is to access chunk data as components from the chunk ref directly rather than fetching a chunk object through these helpers. Deprecated does not mean removed yet, but treat this as a countdown — refactor your chunk reads onto component access now while you have a calm window, not after they disappear. WorldGen SingleInstance is experimental. The WorldGen SingleInstance field is now marked experimental. If your generation code or custom worldgen leans on it, expect it to move, and avoid building anything load-bearing on top of it for now. Transport#bind signature change (Hotfix 1). As of the May 29 Hotfix 1, Transport#bind(InetSocketAddress) now returns a CompletableFuture<ServerListener> and no longer declares throws InterruptedException. If you bind a listener anywhere in your bootstrap, your call site needs to handle the future and drop the now-removed checked exception. It is a small change, but it is a compile break if you ignore it. If you are standing up a plugin build pipeline for the first time, or you want a refresher on the plugin lifecycle before you touch any of the above, our Hytale modding API and server plugin development guide walks through it end to end. Free Security Wins: The Anti-Cheat Hardening Not every change in this build costs you effort. Two server-side anti-cheat improvements ship in Update 6 Part 1 that you inherit simply by updating — no configuration, no plugin work. Both target modified clients, and both close exploit classes that competitive and PvP servers have lived with. The first hardens projectiles. Per the patch notes, "Projectile spawn positions are now derived from the server's authoritative entity transform, with the client-reported position only accepted when it falls within a velocity-based desync allowance." In plain terms: the server now decides where an arrow or thrown object originates based on its own authoritative view of where your entity actually is, and it only trusts the client's reported position when that position falls inside a tolerance the server's velocity math allows. That shuts down teleport-shot and origin-spoofing exploits where a modified client claims a projectile launched from somewhere it physically was not. The second validates interaction range. "NPC and mount interactions now validate the player's distance to the target entity, preventing modified clients from interacting with NPCs or mounting entities from arbitrary distances." Reach-hack-style interactions against NPCs and mounts are now distance-checked server-side. For any server running shopkeepers, quest-givers, or mountable creatures, that removes a long-distance exploit vector for nothing more than the cost of updating you were already going to pay. Movement & Stability Fixes Riding Along The Update 6 Part 1 build also inherits the stabilization wave that followed the Update 5 stable launch — the May 27 hotfixes spanning versions 0.5.1, 0.5.2, and 0.5.3, carried into Update 6 Part 1's own Hotfix 1 on May 29. So whichever branch you land on, the movement and stability layer is solid. On movement, sprint is now preserved when crouch-sliding instead of dropping back to a walk, rolling on landing correctly reduces fall damage again, and a sprint-input reset bug was fixed. On stability, a deadlock on invite, a memory leak after leaving a world, and a block-lighting race condition were all resolved — exactly the kind of long-session leaks that hurt a server hosting players for hours. One privacy-relevant change is worth flagging for owners: server addresses are now hidden by default, and the client and server now use the protocol version for server discovery. The protocol-version-aware discovery is the same machinery that makes the hytale/3 cutover clean — discovery itself now respects which protocol a client and server speak. A Step-by-Step Update 6 Cutover Checklist for Server Owners Here is the sequence to run, in order. The point is to do all your verification on the pre-release branch before the protocol bump locks your live fleet to the new version. Stand up a test instance on the pre-release branch. Do not validate on production. Spin up a copy on the Update 6 build and confirm it negotiates hytale/3 with an updated client cleanly. Rebuild your plugins against the new API. Swap BedsPlugin#getInstance() for #get(), migrate cross-world moves onto Universe#transferPlayerAsync(), refactor chunk reads off the deprecated getChunkIf* / getChunkAsync helpers toward component access, fix any Transport#bind call sites for the new CompletableFuture<ServerListener> return, and stop relying on WorldGen SingleInstance. Smoke-test on the test instance. Join with a real updated client, exercise your plugins, watch the logs for the Crash = 7 code (it should never appear once both sides are on hytale/3) and for deprecation warnings. Announce your cutover window. Pick a time, post it everywhere your community looks, and make the instruction explicit: update your client, then connect. Old and new cannot mix, so the message is "we all move together." Move the server and players together. At the window, promote the rebuilt server to the Update 6 build. Anyone still on the old client will bounce with Crash = 7 until they update — which is expected, not a fault. Re-order your three lead tags. The in-game Server Discovery browser now shows only the first three tags before an overflow indicator (the rest appear on hover), so put your most distinctive, highest-intent tags first on both your in-game Server Profile and your listing. Note the 'EU' region is now labelled 'Europe' if you reference regions. Confirm your HytaleCharts listing is live through the cutover. Verify your heartbeat plugin is reporting live player counts on the new build, votifier is still wired up, and your banner and description are current. A protocol bump that takes your server offline for an hour should not also leave a stale "offline" badge on your listing afterward. That is the whole job. The hytale/3 protocol bump is the only hard blocker in Hytale Update 6 Part 1 — it breaks connectivity, so it sets your schedule. Everything else is in your favor: the API changes are a one-time rebuild, the anti-cheat hardening is free, and the movement and stability fixes make the server better the moment you land on the new build. Plan the window, rebuild your plugins, move together, and tidy your tags. And once you are on hytale/3, give your listing a final pass — keep your server current and discoverable so the players you just shepherded through the cutover can find you again on the other side. For the broader build context, the full Update 6 Part 1 patch notes and the official pre-release patch notes have the rest.