Changelog
• Added testing of item tags
• Fix NPCs not spawning on modern versions
• Fix Level NBT missing on enchanted items exception
• WrapperPlayServerScoreboardObjective & WrapperPlayServerUpdateScore fixed on 1.20.3/1.20.4
• Fix Vector3i#subtract
• Addition of VillagerLevel, Rotation, Color and DyeColor
• Fix WrapperPlayServerResourcePackSend in 1.16
• Fix packet re-encoding on Velocity
• Fix certain server listing websites failing to ping PacketEvents servers
• Properly read isFrontText in sign edit wrappers
• Account for an entity eye field in ParticleVibrationData
• Fix GSON component serialization on modern versions
• Correct the maximum durability of ItemTypes.NETHERITE_HELMET
• Fix MojangAPIUtil#requestPlayerTextureProperties(UUID)
• Add new 1.20.4 entity poses
• Addition of WrapperPlayServerActionBar
• Fix player instances being null after a reload
• Fix bStats metrics on velocity module
• Increase AdventureNBTSerialization.DEPTH_LIMIT to 512

Learn how to use 2.2.1 by following our Wiki
Depending on pre-built PacketEvents