Can't test in dev environment

[Entropy159]

Minecraft version

1.20.4

Describe the issue

I'm trying to develop a mod using Immersive Portals, but when I try and playtest, the game crashes when loading a world.

java.lang.ClassCastException: class net.minecraft.client.particle.ParticleManager cannot be cast to class qouteall.imm_ptl.core.ducks.IEParticleManager (net.minecraft.client.particle.ParticleManager and qouteall.imm_ptl.core.ducks.IEParticleManager are in unnamed module of loader net.fabricmc.loader.impl.launch.knot.KnotClassLoader @6973bf95)
	at qouteall.imm_ptl.core.ClientWorldLoader.withSwitchedWorld(ClientWorldLoader.java:561)
	at qouteall.imm_ptl.core.ClientWorldLoader.withSwitchedWorld(ClientWorldLoader.java:586)
	at net.minecraft.client.render.WorldRenderer.redirect$ble000$immersive_portals$redirectRunQueuedChunkUpdates(WorldRenderer.java:8738)
	at net.minecraft.client.render.WorldRenderer.render(WorldRenderer.java:976)
	at net.minecraft.client.render.GameRenderer.renderWorld(GameRenderer.java:1098)
	at net.minecraft.client.render.GameRenderer.redirect$blc000$immersive_portals$redirectRenderingWorld(GameRenderer.java:3728)
	at net.minecraft.client.render.GameRenderer.render(GameRenderer.java:866)
	at net.minecraft.client.MinecraftClient.render(MinecraftClient.java:1327)
	at net.minecraft.client.MinecraftClient.run(MinecraftClient.java:888)
	at net.minecraft.client.main.Main.main(Main.java:265)
	at app//net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:480)
	at app//net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
	at app//net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
	at app//net.fabricmc.devlaunchinjector.Main.main(Main.java:86)

I'm not quite sure why this happens, because it works fine in normal Minecraft. If you need any more info, I'm happy to give it.

[Entropy159]

Turns out I had some mods I was testing in the run folder, and I don't know which one was causing issues but removing them and adding them again fixed it somehow.