[BUG] Discarded entities are stranded in `EntityTickList` and keep ticking

[lnminh1411]

🐛 Describe the bug

A clear and concise description of what the bug is.
After a discarded entity is removed from the world, it can remain in EntityTickList
and continue to tick indefinitely. It is absent from EntityLookup, so command
selectors and /kill cannot see or remove it, but it still runs its tick logic and
still collides with players.
My own experience: XP orbs de-synced, leading to an untracked XP orb exist in the ticklist, but not anywhere in the world -> infinite XP

Note: Disabling Async from config fixes this.

📋 Steps to reproduce*

1. Run a mob farm that produces and collects a high volume of experience orbs.
2. Stand where orbs are collected. Eventually a collected orb strands.
3. Confirm the state: XP and Mending continue with no mobs alive, while
   /kill @e[type=minecraft:experience_orb] reports nothing.
4. Re-enter the world and the effect is gone.

✅ Expected behavior

What did you expect to happen?

• XP orbs are cleared, no XP dupes

❌ Actual behavior

What actually happened?

• XP dupes infinitely, Mending works too, but nothing is there, /kill or /data finds nothing

🖥️ Environment

• 🔧 Async version: Async 0.2.0+alpha
• 🎮 Minecraft enviroment (Client or Server): Singleplayer (Potentially server-sided)
• 🎮 Minecraft version: 1.21.1
• ⚙️ Modloader & version: NeoForge
• 📦 Other mods installed: A lot (see attached logs)

📜 Logs

Please attach your latest.log or crash report if available.
2026-09-03-1.log.gz
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