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what on earth is that, did you create a new instance of your Item?

i would recommend you to use removeIf, something like this: event.getGeneration().getFeatures(GenerationStep.Decoration.UNDERGROUND_ORES).removeIf((supplier) -> { }); then you can loop inside the removeIf through the ConfiguredFeatures, after that check if the ConfiguredFeature.feature is an OreFeature, then get the OreConfiguration of the feature and from that you can get the targetStates which you can map to a List of Blocks. then return inside the removeIf if the List contains for example Blocks.COAL_ORE that was now very theoretical, you can look at this for a practical example

you need to use ConfiguredFeature#getFeatures

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