1.21.1 Neoforge 21.1.250 - registerReloadListener called on wrong thread #475

I'm playing on a modified version of all of create aeronautics with codechickenlib, project red and ender storage being part of the modified mod list, me and my friends will get random occasional crashes in early loading of the modpack with this error:

[ModernFix/]: A mod is calling registerReloadListener at the wrong time. This will cause random concurrency crashes when ModernFix is not installed. Please report this to them. If you are a modder, refer to https://github.com/embeddedt/ModernFix/wiki/registerReloadListener-called-on-wrong-thread for more information. java.lang.Exception: registerReloadListener called on wrong thread at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.packs.resources.ReloadableResourceManager.wrapMethod$zml000$modernfix$checkCallingThread(ReloadableResourceManager.java:536) ~[client-1.21.1-20240808.144430-srg.jar%23501!/:?] at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.packs.resources.ReloadableResourceManager.registerReloadListener(ReloadableResourceManager.java) ~[client-1.21.1-20240808.144430-srg.jar%23501!/:?] at TRANSFORMER/codechickenlib@4.6.1.529/codechicken.lib.util.ResourceUtils.registerReloadListener(ResourceUtils.java:57) ~[CodeChickenLib-1.21.1-4.6.1.529.jar%23546!/:4.6.1.529] at TRANSFORMER/projectred_core@4.23.0/mrtjp.projectred.core.init.CoreClientInit.clientSetup(CoreClientInit.java:43) ~[ProjectRed-1.21.1-4.23.0-core.jar%23743!/:?] ...... [03Oct2026 12:38:35.390] [Render thread/ERROR] [net.neoforged.bus.EventBus/EVENTBUS]: Exception caught during firing event: null

It seems like there's a chance that codechickenlib/project red will cause a Concurrent Modification Exception, and ModernFix is saying that the listener might be the cause.

Here is the logs
latest.log
crash-2026-10-03_12.38.36-client.txt

It's not a consistent crash though, sometimes it loads and runs fine, other times crashes on load. Let me know if you need any other details. (This is a crash I've been reported has happened to many of my friends playing)