First person attack animation height will not change when sneaking

[Acat1234]

Minecraft version - 1.20.1
Mod loader - Forge
Mod version - 1.8.6
I am using the latest version available - No/Yes (I'm using the latest version I can use for 1.20.1)

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Get weapon
2. Use weapon
3. Use weapon while sneaking
4. See that the height will not change

Expected behavior
For the first person animation position to change

Screenshots or video recordings