Underwater Swim Fix: Fixing the MC-220390 Swimming Bug
Ignoring underwater movement issues in Minecraft can ruin complex builds and exploration. The Underwater Swim Fix: Fixing the MC-220390 Swimming Bug addresses a critical desynchronization error between client-side animations and server logic. This technical patch ensures your character behaves predictably when sprinting or navigating tight 1x1 passages beneath the surface.
Resolving Client-Server Desync Issues
The core issue identified as MC-220390 occurs specifically during high-speed swimming actions. When a player holds the sprint key and collides with an entity or block, the client often continues rendering movement while the server registers the player differently. This mismatch causes "rubber-banding," freezing animations, or forcing players out of ocean monuments.
This mod targets that specific mechanic without altering game balance or adding new inventory items. By synchronizing hitbox states upon collision, it eliminates false swim statuses and restores smooth physics for underwater bases and farm setups.
Tech Specs & Version Support
Developers have focused this fix on modern iterations of the sandbox title. It operates seamlessly across major releases including Minecraft 1.20, 1.21, and 1.21+. Compatibility extends to both Java Edition and Bedrock platforms where specific legacy patches are applied.
- Supported Loaders: Forge, Fabric
- Minecraft Versions: 1.20.x through latest stable releases
- File Size: Minimal impact on RAM usage and FPS
This lightweight utility is ideal for server administrators managing large networks with multiple concurrent versions. It prevents lag spikes caused by constant state re-calculations during underwater combat or construction.
Installation Guide: How to Install
The process of how to install this correction is streamlined, especially when using dedicated mod launchers like FoxyGame or standard Fabric/Forge managers.
- Navigate to the mods folder within your Minecraft installation directory.
- Locate the archive labeled Underwater Swim Fix matching your exact game version (e.g., 1.20-1).zip).
- If you prefer a launcher, click "Download" and ensure the file is selected in your mod list before launching the client.
There are no complex configuration files required for basic operation. The fix applies automatically once loaded alongside other quality-of-life mods or vanilla patches.
Performance Impact on Server Stability
In multiplayer environments, network latency often exacerbates swimming bugs. Players with high ping frequently experience teleportation when moving underwater. This patch mitigates that frustration by enforcing stricter state validation rules before the server accepts movement data packets.
The result is a more stable environment for team-based projects or competitive parkour courses located in deep ocean biomes. It reduces complaints about unfair mechanics and ensures fair play during boss battles involving guardians.
Why Choose This Specific Patch?
Maintaining Underwater Swim Fix: Fixing the MC-220390 Swimming Bug in your loadout provides immediate benefits without cluttering the inventory. Unlike massive techpacks that overhaul crafting recipes, this tool focuses exclusively on physics correction.
- Predictable Movement: Stop glitching through walls when sprinting underwater.
- Smoother Combat: Maintain precise aim against mobs without erratic swimming animations interrupting your line of sight.
- Better Build Integrity: Navigate narrow tunnels in ocean monuments with confidence, knowing the server and client agree on position.
If you value a stable gaming experience where basic mechanics function logically, this addition is essential. It returns the intended feeling of fluid motion found in vanilla Minecraft while patching years worth of reported anomalies.