Guidelines

• By checking this box, I am saying that I have read the guidelines and believe to be following them to the best of my ability

Minecraft Version

1.20.1

Mod Version

4.1

Mod Loader

NeoForge

Mod Loader Version

47.1.105

Describe the bug

Having a Wither Storm nearby while having Immersive Portals installed will quickly cause a JVM crash. I believe the issue relates to block cluster rendering.
Note - I am running Immersive Portals via Sinytra Connector, but it does an excellent job with rendering based mods so I don't believe the issue is because of Connector (though not like it could be tested otherwise)

Steps to Reproduce

1. Install Immersive Portals (via Sinytra Connector)
2. Summon a Wither Storm
3. Vibe for a short while

Crash Reports/Logs

https://gist.github.com/soup587/9b360cefb7c75654dd45786163afd94f

Is OptiFine installed?

• OptiFine is installed

Screenhots

No response

Mod List

200+ - not reasonable to list

At the bottom of the Immersive Portals description, it says that it's not recommended to use Sinytra, so that might actually be the issue. It's also apparently only compatible with one version of sodium/iris, so that might be contributing if they're installed.

ModernFix is enabled, uninstall that first since that also causes a JVM error.

Doesn’t immersive portals have a forge version? This crash is likely one immersive portals would need to fix because it breaks everything

ModernFix is enabled, uninstall that first since that also causes a JVM error.

I have the patch that causes the crash disabled, this one's a different crash

Doesn’t immersive portals have a forge version? This crash is likely one immersive portals would need to fix because it breaks everything

It does, but it's not on 1.20

yeah i would screenshot your modlist, even if it is 200 mods. So people can point out if you have incompatible mods.

forgot which setting it was but disabling one of the block cluster optimizations fixed the issue

tried on a fresh instance and it occurs with just cwsm, sinytra and immersive portals

I've tested this with the latest versions of Sinytra (1.0.0-beta.45+1.20.1), Forgified Fabric API, (0.92.2+1.11.8+1.20.1) CWSM (4.1), and Immersive Portals (3.3.9-mc1.20.1-fabric) and cannot replicate this issue. It may have gotten fix, but it's more likely that this is just such an obscure and hard-to-replicate bug using very experimental mods. I doubt I'll be able to fix this if you're still experiencing it,