https://pastebin.com/GTP2Et3J

I get the following crash when clicking on the vanilla recipe book, 100% reproduction rate.

Odd, I will see what mod causes it then. I was drawn here because the crash log specifically mentioned an Erebus recipe.

I get the same problem on a fresh Sponge+Forge server with this crash log:

Error: java.lang.IllegalArgumentException: Attempted to get the ID for a unknown recipe: erebus.recipes.RecipeSprintLeggingsUpgrades@68b793f9 Name: erebus:leggings_upgrades

I can only reproduce this in multiplayer though.
No other mods are installed apart from the Sponge 7.1.0 framework.