You know the whole Bukkit, Cauldron, Spigot, etc Stuff that is for Server Backends? Yeah those modify Serverside Code a lot. That’s why I would prefer to turn off that specific piece of ASM when on a standalone Server so it works better out of the box.
Edit I got an Idea, Forge has a Bukkit Detector thingamabob, maybe that works.
Edit 2: Okay maybe not that, kinda hard to find where the F that is. Lets just check if its a Server or not.