MC-265520 Patch

Fabric mod which fixes MC-265520 in Minecraft versions <1.20.5

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About this Mod

What does this mod do?

This is a fabric mod which fixes MC-265520 in Minecraft versions <1.20.5.

What is MC-265520 about?

MC-265520 is about a race condition when switching between protocol states. The protocol states get switched while decoding packets and Minecraft expects the old protocol state when handling the switching packet on the main thread.

How does this mod solve the issue?

This mod moves the FlowControlHandler added because of MC-265209 in front of the handler which switches protocol states.
The mod also uses a custom FlowControlHandler (based on the old, MIT-licensed AutoReadHolderHandler of Velocity) instead of changing how the entire networking pipeline works (as Mojang did in 1.20.5).

Available Versions

MC-265520-Patch v1.0.0release

MC 1.20.3, 1.20.4fabric

April 11, 2024

How to Install MC-265520 Patch on Your Server

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.20.4).

Install Mod

Open the mod browser in the dashboard and search for "MC-265520 Patch". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.20.4, 1.20.3

Server-side

✗ Unsupported

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

MC-265520 Patch server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.20.4). You can switch loaders with one click in the panel.

Is MC-265520 Patch compatible with fabric?

MC-265520 Patch officially supports fabric for Minecraft 1.20.4, 1.20.3. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with MC-265520 Patch – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if MC-265520 Patch consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.