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Underwater Swim Fix (MC-220390)

Underwater Swim Fix (MC-220390)

MOD
Fixes the bug where if you hit an entity while swimming and holding the sprint hotkey, the server will think that you are not swimming anymore, while the client does. resulting in weird behavior.
by bikerboys
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362,050 downloads
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Updated Oct 14, 2026
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Bug Fixes Server Utility Utility & QoL
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Fixes [MC-220390](https://bugs.mojang.com/browse/MC/issues/MC-220390) a bug where if you hit an entity while swimming and holding the sprint hotkey, the hitboxes server and clientside will be different. Resulting in weird behaviour where the client thinks that theyre swimming while the server doesnt think that. So when you for example try to go into a 1x1 block space while experiencing this bug, you will glitch out until you stop swimming and swim again.

The bug really annoyed me in monuments so I fixed it.

 

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underwater-swim-fix-1.0.2.jar
MC 1.21.2-Snapshot, 1.21, 1.21.6-snapshot, 1.18.1, 1.20.2-Snapshot, 1.20.5-Snapshot, 1.19-Snapshot, 1.21.1-Snapshot, 1.19.3, 1.20.2, 1.19.4, Fabric, 1.21.8, 1.19.4-Snapshot, 1.20.5
Release 2026-01-06 Get
underwater-swim-fix-1.0.3.jar
MC Fabric, Server, 1.21.11-snapshot, 1.21.11, 26.1-snapshot
Release 2026-01-06 Get
underwater-swim-fix-1.0.1.jar
MC 1.16.3, 1.13.1, 1.16-Snapshot, 1.17.1, 1.21.2-Snapshot, 1.21, 1.21.6-snapshot, 1.15-Snapshot, 1.16.1, 1.18.1, 1.20.2-Snapshot, 1.20.5-Snapshot, 1.14.3, 1.15, 1.16, 1.13
Release 2025-10-04 Get
underwater-swim-fix-1.0.0-1.19.2-1.20.4.jar
MC 1.19.3, 1.20.2, 1.19.4-Snapshot, 1.20.2-Snapshot, 1.19.4, Fabric, 1.19-Snapshot, 1.19.2, 1.20.3-Snapshot, 1.20.3, 1.20.1, 1.20, 1.19.1, 1.20.4, 1.20-Snapshot, Server, 1.19
Release 2025-04-25 Get
underwater-swim-fix-1.0.0-1.20.5+.jar
MC 1.21.2-Snapshot, 1.21, 1.21.6-snapshot, 1.20.5, 1.21.5, 1.20.5-Snapshot, Fabric, 1.21.8, 1.21.1-Snapshot, 1.21.4, 1.21.5-Snapshot, 1.20.6, 1.21-Snapshot, 1.21.3, 1.21.7, 1.21.1
Release 2025-04-25 Get

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