Minecraft version - 1.20.1
Mod loader - NeoForge 47.1.99
Mod version - Fabric 1.8.4, using Sinytra Connector 1.0.0-beta.32
I am using the latest version available - Kind of

Describe the bug
As the title described.

To Reproduce
Steps to reproduce the behavior:

1. Put any two-handed weapon in the offhand slot.
2. Swap the weapon to hotbar. (by pressing F by default)
3. The weapon disappears.

Expected behavior
The weapon should not disappear.

Screenshots or video recordings

Additional context
Playing Prominence II Classic modpack (v2.6.0).

Use Forge specific version, which has this issue fixed.

Then can you make this mod compatible with NeoForge? The latest version of this mod (for Forge) requires the Forge version to be at least 47.2.0, but NeoForge does not (yet) reach such version number.

1.8.0 can be used with NeoForge

Dedicated NeoForge support will be added in the future.

Thank you!