diff --git a/src/data/kotlin/ru/dbotthepony/mc/otm/datagen/WorldGen.kt b/src/data/kotlin/ru/dbotthepony/mc/otm/datagen/WorldGen.kt
index f40c0c6c9..ad8c630ef 100644
--- a/src/data/kotlin/ru/dbotthepony/mc/otm/datagen/WorldGen.kt
+++ b/src/data/kotlin/ru/dbotthepony/mc/otm/datagen/WorldGen.kt
@@ -65,7 +65,7 @@ fun registerConfiguredFeatures(context: BootstrapContext<ConfiguredFeature<*, *>
 
 	context.register(ConfiguredFeatures.BLACK_HOLE, ConfiguredFeature(
 		MWorldGenFeatures.BLACK_HOLE_PLACER,
-		BlackHolePlacerFeature.Config(0.001f, Decimal("0.25"), Decimal(1))))
+		BlackHolePlacerFeature.Config(Decimal("0.25"), Decimal(1))))
 }
 
 private object PlacedFeatures {
@@ -152,6 +152,7 @@ fun registerPlacedFeatures(context: BootstrapContext<PlacedFeature>) {
 	context.register(PlacedFeatures.BLACK_HOLE, PlacedFeature(
 		blackHole,
 		listOf(
+			RarityFilter.onAverageOnceEvery(1000),
 			InSquarePlacement.spread(),
 			HeightRangePlacement.uniform(VerticalAnchor.absolute(64), VerticalAnchor.absolute(128))
 		)
diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/container/CombinedContainer.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/container/CombinedContainer.kt
index a7094db4a..946136c0c 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/container/CombinedContainer.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/container/CombinedContainer.kt
@@ -34,6 +34,10 @@ class CombinedContainer(containers: Stream<Pair<Container, Iterable<Int>>>) : IM
 		override val container: Container
 			get() = this@CombinedContainer
 
+		override fun setChanged() {
+			outer.setChanged()
+		}
+
 		override fun component1(): Int {
 			return super.component1()
 		}
diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/menu/Slots.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/menu/Slots.kt
index 640b6156a..bf6ee95a6 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/menu/Slots.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/menu/Slots.kt
@@ -51,6 +51,14 @@ inline fun <S : Slot> makeSlots(containers: List<Container>?, size: Int, initial
 open class MatterySlot(container: Container, index: Int, x: Int = 0, y: Int = 0) : Slot(container, index, x, y) {
 	var ignoreSpectators = true
 
+	override fun setChanged() {
+		if (container is IMatteryContainer) {
+			(container as IMatteryContainer).setChanged(containerSlot)
+		} else {
+			super.setChanged()
+		}
+	}
+
 	override fun mayPickup(player: Player): Boolean {
 		return super.mayPickup(player) && (!ignoreSpectators || !player.isSpectator)
 	}
diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/worldgen/feature/BlackHolePlacer.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/worldgen/feature/BlackHolePlacer.kt
index 4c0056db6..102d3eccf 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/worldgen/feature/BlackHolePlacer.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/worldgen/feature/BlackHolePlacer.kt
@@ -15,13 +15,12 @@ import ru.dbotthepony.mc.otm.registry.game.MBlocks
 object BlackHolePlacerFeature : Feature<BlackHolePlacerFeature.Config>(
 	RecordCodecBuilder.create {
 		it.group(
-			Codec.floatRange(0.0F, 1.0F).fieldOf("chance").forGetter(Config::chance),
 			DecimalCodec.fieldOf("matter_min").forGetter(Config::minMatter),
 			DecimalCodec.fieldOf("matter_max").forGetter(Config::maxMatter)
 		).apply(it, ::Config)
 	}
 ) {
-	data class Config(val chance: Float, val minMatter: Decimal, val maxMatter: Decimal) : FeatureConfiguration
+	data class Config(val minMatter: Decimal, val maxMatter: Decimal) : FeatureConfiguration
 
 	override fun place(context: FeaturePlaceContext<Config>): Boolean {
 		val random = context.random()
@@ -30,7 +29,7 @@ object BlackHolePlacerFeature : Feature<BlackHolePlacerFeature.Config>(
 
 		val config = context.config()
 
-		if (level.getBlockState(pos).isAir && random.nextDouble() < config.chance.toDouble()) {
+		if (level.getBlockState(pos).isAir) {
 			if (level.setBlock(pos, MBlocks.BLACK_HOLE.defaultBlockState(), 2)) {
 				val entity = level.getBlockEntity(pos)