Forge 1.20.1 server — players fall into void, chunks not loading, timeout (NOT FIXED)

[/u/SIKILIYOM]

Hey, I’m hosting a Forge 1.20.1 server and I’m stuck with a really weird issue.

Problem:

• Players join -> instantly fall into the void
• Chunks don’t load at all
• After ~20–30 seconds -> “Timed out”
• Basically unplayable

What’s weird:

• Vanilla server (same PC) -> works perfectly
• Ping is very low (using ZeroTier, <1ms)
• I tried using Tailscale, Localtonet, ZeroTier, Playitgg, RadminVPN i had the same issue
• Server TPS seems fine
• World generates normally

What I tried:

• Deleted world multiple times -> same issue
• Reduced mods to minimum (even 1–2 mods) -> still happens
• Removed client-side mods from server -> no change
• Lowered view-distance/simulation-distance -> no change
• Waited for full world load before joining->→ no change

Important detail:

• Forge version: 47.4.20
• Minecraft: 1.20.1
• Java: originally Java 25 -> switched to Java 17 (Temurin)
• Issue STILL persists after switching Java

Symptoms in logs:

• No major errors
• Players connect, then eventually timeout
• Looks like chunk packets are not reaching client

Question:
Has anyone seen this before????
Is this a Forge bug, mod compatibility issue, or something related to networking (even though vanilla works fine)?

At this point I’m completely stuck, any help would be appreciated.

submitted by /u/SIKILIYOM
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