--- a/net/minecraft/world/level/levelgen/structure/placement/StructurePlacement.java
+++ b/net/minecraft/world/level/levelgen/structure/placement/StructurePlacement.java
@@ -79,14 +_,30 @@
         return this.exclusionZone;
     }
 
+    @Deprecated @io.papermc.paper.annotation.DoNotUse // Paper - Add missing structure set seed configs
     public boolean isStructureChunk(ChunkGeneratorStructureState structureState, int x, int z) {
+        // Paper start - Add missing structure set seed configs
+        return this.isStructureChunk(structureState, x, z, null);
+    }
+    public boolean isStructureChunk(ChunkGeneratorStructureState structureState, int x, int z, @org.jetbrains.annotations.Nullable net.minecraft.resources.ResourceKey<StructureSet> structureSetKey) {
+        Integer saltOverride = null;
+        if (structureSetKey != null) {
+            if (structureSetKey == net.minecraft.world.level.levelgen.structure.BuiltinStructureSets.MINESHAFTS) {
+                saltOverride = structureState.conf.mineshaftSeed;
+            } else if (structureSetKey == net.minecraft.world.level.levelgen.structure.BuiltinStructureSets.BURIED_TREASURES) {
+                saltOverride = structureState.conf.buriedTreasureSeed;
+            }
+        }
+        // Paper end - Add missing structure set seed configs
         return this.isPlacementChunk(structureState, x, z)
-            && this.applyAdditionalChunkRestrictions(x, z, structureState.getLevelSeed())
+            && this.applyAdditionalChunkRestrictions(x, z, structureState.getLevelSeed(), saltOverride) // Paper - Add missing structure set seed configs
             && this.applyInteractionsWithOtherStructures(structureState, x, z);
     }
 
-    public boolean applyAdditionalChunkRestrictions(int regionX, int regionZ, long levelSeed) {
-        return !(this.frequency < 1.0F) || this.frequencyReductionMethod.shouldGenerate(levelSeed, this.salt, regionX, regionZ, this.frequency);
+    // Paper start - Add missing structure set seed configs
+    public boolean applyAdditionalChunkRestrictions(int regionX, int regionZ, long levelSeed, @org.jetbrains.annotations.Nullable Integer saltOverride) {
+        return !(this.frequency < 1.0F) || this.frequencyReductionMethod.shouldGenerate(levelSeed, this.salt, regionX, regionZ, this.frequency, saltOverride);
+        // Paper end - Add missing structure set seed configs
     }
 
     public boolean applyInteractionsWithOtherStructures(ChunkGeneratorStructureState structureState, int x, int z) {
@@ -101,25 +_,31 @@
 
     public abstract StructurePlacementType<?> type();
 
-    private static boolean probabilityReducer(long levelSeed, int regionX, int regionZ, int salt, float probability) {
+    private static boolean probabilityReducer(long levelSeed, int regionX, int regionZ, int salt, float probability, @org.jetbrains.annotations.Nullable Integer saltOverride) { // Paper - Add missing structure set seed configs; ignore here
         WorldgenRandom worldgenRandom = new WorldgenRandom(new LegacyRandomSource(0L));
         worldgenRandom.setLargeFeatureWithSalt(levelSeed, regionX, regionZ, salt);
         return worldgenRandom.nextFloat() < probability;
     }
 
-    private static boolean legacyProbabilityReducerWithDouble(long baseSeed, int salt, int chunkX, int chunkZ, float probability) {
+    private static boolean legacyProbabilityReducerWithDouble(long baseSeed, int salt, int chunkX, int chunkZ, float probability, @org.jetbrains.annotations.Nullable Integer saltOverride) { // Paper - Add missing structure set seed configs
         WorldgenRandom worldgenRandom = new WorldgenRandom(new LegacyRandomSource(0L));
+        if (saltOverride == null) { // Paper - Add missing structure set seed configs
         worldgenRandom.setLargeFeatureSeed(baseSeed, chunkX, chunkZ);
+        // Paper start - Add missing structure set seed configs
+        } else {
+            worldgenRandom.setLargeFeatureWithSalt(baseSeed, chunkX, chunkZ, saltOverride);
+        }
+        // Paper end - Add missing structure set seed configs
         return worldgenRandom.nextDouble() < probability;
     }
 
-    private static boolean legacyArbitrarySaltProbabilityReducer(long levelSeed, int salt, int regionX, int regionZ, float probability) {
+    private static boolean legacyArbitrarySaltProbabilityReducer(long levelSeed, int salt, int regionX, int regionZ, float probability, @org.jetbrains.annotations.Nullable Integer saltOverride) { // Paper - Add missing structure set seed configs
         WorldgenRandom worldgenRandom = new WorldgenRandom(new LegacyRandomSource(0L));
-        worldgenRandom.setLargeFeatureWithSalt(levelSeed, regionX, regionZ, 10387320);
+        worldgenRandom.setLargeFeatureWithSalt(levelSeed, regionX, regionZ, saltOverride != null ? saltOverride : HIGHLY_ARBITRARY_RANDOM_SALT); // Paper - Add missing structure set seed configs
         return worldgenRandom.nextFloat() < probability;
     }
 
-    private static boolean legacyPillagerOutpostReducer(long levelSeed, int salt, int regionX, int regionZ, float probability) {
+    private static boolean legacyPillagerOutpostReducer(long levelSeed, int salt, int regionX, int regionZ, float probability, @org.jetbrains.annotations.Nullable Integer saltOverride) { // Paper - Add missing structure set seed configs; ignore here
         int i = regionX >> 4;
         int i1 = regionZ >> 4;
         WorldgenRandom worldgenRandom = new WorldgenRandom(new LegacyRandomSource(0L));
@@ -147,7 +_,7 @@
 
     @FunctionalInterface
     public interface FrequencyReducer {
-        boolean shouldGenerate(long levelSeed, int i, int salt, int regionX, float regionZ);
+        boolean shouldGenerate(long levelSeed, int i, int salt, int regionX, float regionZ, @org.jetbrains.annotations.Nullable Integer saltOverride); // Paper - Add missing structure set seed configs
     }
 
     public static enum FrequencyReductionMethod implements StringRepresentable {
@@ -167,8 +_,8 @@
             this.reducer = reducer;
         }
 
-        public boolean shouldGenerate(long levelSeed, int salt, int regionX, int regionZ, float probability) {
-            return this.reducer.shouldGenerate(levelSeed, salt, regionX, regionZ, probability);
+        public boolean shouldGenerate(long levelSeed, int salt, int regionX, int regionZ, float probability, @org.jetbrains.annotations.Nullable Integer saltOverride) { // Paper - Add missing structure set seed configs
+            return this.reducer.shouldGenerate(levelSeed, salt, regionX, regionZ, probability, saltOverride); // Paper - Add missing structure set seed configs
         }
 
         @Override
