Have you asked for help on discord?

NO

Minecraft Version/s

1.21.1

Modloader

Fabric

Modloader Version

Client: 0.16.5-7
Server: 0.16.7

Operating System

macOS, Linux

List of all other installed mods

• Spyglass Improvements
• Fabric API
• Fabric Language Kotlin
• libIPN
• Inventory Profiles Next

Describe the problem

The spyglass gets stuck in the offhand when quickly tapping the hotkey brought by Spyglass Improvements when on a server - even when IPN is installed on the server side.

Steps to reproduce

1. Be on a server
2. Press the hotkey for Spyglass Improvements quicker
3. Observe the spyglass getting stuck in the offhand
   This problem is exacerbated by higher ping, but happens from 20+ ping

I have tried to reproduce the problem with only or without "Inventory Profiles Next" and its dependencies installed.

• I have tested without 'Inventory Profiles Next' and its dependencies
• I have tested with only 'Inventory Profiles Next' and its dependencies and no other mods

First of all IPN is pure client side mod. Having it on the server does nothing.
I'm sure Spyglass improvements is also client side.

Please report this to them they can use the IPN API to selve it.

First of all IPN is pure client side mod. Having it on the server does nothing. I'm sure Spyglass improvements is also client side.

Please report this to them they can use the IPN API to selve it.

I wasn't completely sure, and wouldn't be the first time a client mod has some sort of server compatibility component.
Anyway, reported it on their side too.