I believe this belongs on the Distant Horizons gitlab issues, but I don't have an account on there.
There is no crash tho, so no crashlog.

net.minecraft.ReportedException: Feature placement at TRANSFORMER/[email protected]/net.minecraft.world.level.chunk.ChunkGenerator.m_183372_(ChunkGenerator.java:495) at TRANSFORMER/[email protected]/forge.com.seibel.lod.common.wrappers.worldGeneration.step.StepFeatures.generateGroup(StepFeatures.java:73) at TRANSFORMER/[email protected]/forge.com.seibel.lod.common.wrappers.worldGeneration.BatchGenerationEnvironment.generateDirect(BatchGenerationEnvironment.java:581) at TRANSFORMER/[email protected]/forge.com.seibel.lod.common.wrappers.worldGeneration.BatchGenerationEnvironment.generateLodFromList(BatchGenerationEnvironment.java:452) at TRANSFORMER/[email protected]/forge.com.seibel.lod.common.wrappers.worldGeneration.GenerationEvent.lambda$new$0(GenerationEvent.java:75) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) at java.base/java.lang.Thread.run(Thread.java:833) Caused by: java.lang.NullPointerException: Cannot read field "f_59788_" because "entity" is null at TRANSFORMER/[email protected]/shadows.apotheosis.util.SpawnerStats.apply(SpawnerStats.java:40) at TRANSFORMER/[email protected]/shadows.apotheosis.adventure.spawner.SpawnerItem.place(SpawnerItem.java:57) at TRANSFORMER/[email protected]/shadows.apotheosis.adventure.spawner.RogueSpawnerFeature.m_142674_(RogueSpawnerFeature.java:37) at TRANSFORMER/[email protected]/net.minecraft.world.level.levelgen.feature.Feature.m_204740_(Feature.java:153) at TRANSFORMER/[email protected]/net.minecraft.world.level.levelgen.feature.ConfiguredFeature.m_65385_(ConfiguredFeature.java:27) at TRANSFORMER/[email protected]/net.minecraft.world.level.levelgen.placement.PlacedFeature.m_191789_(PlacedFeature.java:56) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411) at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762) at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:276) at java.base/java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411) at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762) at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:276) at java.base/java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411) at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762) at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:276) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.IntPipeline$1$1.accept(IntPipeline.java:180) at java.base/java.util.stream.Streams$RangeIntSpliterator.forEachRemaining(Streams.java:104) at java.base/java.util.Spliterator$OfInt.forEachRemaining(Spliterator.java:711) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:276) at java.base/java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) at TRANSFORMER/[email protected]/net.minecraft.world.level.levelgen.placement.PlacedFeature.m_191797_(PlacedFeature.java:55) at TRANSFORMER/[email protected]/net.minecraft.world.level.levelgen.placement.PlacedFeature.m_191806_(PlacedFeature.java:44) at TRANSFORMER/[email protected]/net.minecraft.world.level.chunk.ChunkGenerator.m_183372_(ChunkGenerator.java:475) ... 9 more

I don't really know what the root cause is there, but the code flow is me setting a Spawner block into the world, which generates a Spawner block entity - and then retrieving it is null. This is a pretty grave violation of contract, and nothing I can fix.

Additionally, 1.18 is out of support.