Temporary First Person does not work for multiplayer

[kharlun]

Minecraft Version

1.21.1

Mod Version

2.3.0

Mod Loader

NeoForge

Describe the bug

Adding spyglass to Temporary First person items works for singleplayer, but not on a server.

to reproduce:

1. play singleplayer
2. add "minecraft:spyglass" to temporary first person
3. works as intended
4. play multiplayer, with mod installed server and client side
5. add "minecraft:spyglass" to temporary first person
6. does not work as intended

To Reproduce

No response

Expected behaviour

No response

Additional context

No response