Looks like this isnโt chunk corruption at all โ the stacktrace points to NaturalSpawner hanging during mob spawn checks. A few things to try: This is usually caused by a mob / biome / dimension mod doing something expensive or invalid during spawning. Even if you removed some big mods, configs can persist in the world โ try generating a fresh test world with the same modlist to confirm. Install a profiler (highly recommend spark) and capture a report right before / after the freeze. NaturalSpawner stalls almost always show clearly there. Common culprits on Minecraft Java Edition 1.20.1 + Minecraft Forge 47.x: custom mob mods biome overhauls structure/worldgen mods leftover datapacks Since it happens even solo, RAM and player count arenโt the issue. Also 16 GB is overkill โ try lowering to ~8โ10 GB (too much RAM can increase GC pauses). Delete: /world/datapacks /world/serverconfig then let them regenerate. If Spark shows NaturalSpawner looping, binary-search your remaining mods (half at a time). Painful, but fastest. Short version: this is almost certainly a spawn-related mod or datapack, not vanilla chunks.
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Oliviia Rich · Just now 1 min
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