(Not fixed yet , 1/17/2025)Player Unintentionally Jumps Higher Than Expected When Stepping Over Half-Blocks in Specific Situations

[SHengZi578]

This issue occurs when only Valkyrien Skies and addons are installed and no other mods

• I have tested this issue and it occurs when no other mods are installed

Minecraft Version

1.20.x

Mod Loader

Forge

Issue description

In the Minecraft 1.20.1 Forge version with the Valkyrien Skies mod installed, I have encountered a bug related to player movement over half-block height obstacles in specific situations. When the player is obstructed by a full block ahead while moving forward and holds down the forward key, attempting to step over a half-block height (such as a slab or stair) from the side triggers a jump instead of a smooth step-up. This jumping behavior is not present in vanilla Minecraft and results in the player ascending one full block height rather than remaining above the half-block. This issue occurs frequently and significantly impacts the gameplay experience. Especially in mods that can alter the player's jump height, this bug causes the player to jump abnormally high, sometimes even resulting in fall damage due to the excessive jump, akin to having a jump boost buff. This not only disrupts the player's normal movement rhythm but can also cause unnecessary in-game harm.

Issue reproduction

Launch Minecraft with the specified Forge and Valkyrien Skies mod versions.
Create or join a world.
Place one or more full blocks and a half-block height obstacle (e.g., a slab or stair) on the ground, ensuring the half-block is obstructed by a full block ahead.
Stand next to the full block, face the half-block obstacle, and hold down the forward key.
Attempt to step over the full block and the half-block obstacle from the side.
Observe that the player jumps one full block height instead of smoothly stepping over the half-block.

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[SHengZi578]

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[SHengZi578]

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