Both SpongeForge and FoamFix add various optimizations that may not work with each other! Disable the following settings in the config/foamfix.cfg B:optimizedBlockPos=false (Sponge adds a similar performance patch) B:patchChunkSerialization=false -> SPONGEFORGE USERS GO HERE <- Server crash when startup · Issue #166 · asiekierka/FoamFix · GitHub
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