It may work perfectly on Spigot but fail on Paper or TacoSpigot.
It might seem counterintuitive to focus on a version released nearly a decade ago. However, Minecraft 1.8 (The Bountiful Update) remains the "Gold Standard" for competitive PvP servers. Its combat mechanics, movement physics, and relatively low hardware requirements make it the preferred choice for massive networks like Hypixel or smaller practice arenas. Scoreboard 1.8.1 Dev
The "Dev" tag is there for a reason. Unlike "Release" versions, development builds are often "bleeding edge." This means: It may work perfectly on Spigot but fail
If you are a developer looking to hook into the API, or an admin installing it, keep these steps in mind: Installation for Admins or an admin installing it