Please read the changelog for 2.4.0-beta.1 first

These changes apply to Minecraft 1.21.1 and below:

• Vanilla lanterns now display correctly on the player without a resource pack reload.
• Added client option "Modded lantern workaround". When enabled, forces a resource pack reload on first world load to align modded lanterns to correctly display on the player when equipped. Disabled by default, only needed if you want to wear lanterns added by mods.

This change applies to all Fabric versions:

• Added support for Spyglass Astronomy. Features from the mod can now be used when using the spyglass from the accessory slot.