diff --git a/src/main/java/com/minelittlepony/unicopia/datagen/providers/UAdvancementsProvider.java b/src/main/java/com/minelittlepony/unicopia/datagen/providers/UAdvancementsProvider.java
index 54553946..3b7e0210 100644
--- a/src/main/java/com/minelittlepony/unicopia/datagen/providers/UAdvancementsProvider.java
+++ b/src/main/java/com/minelittlepony/unicopia/datagen/providers/UAdvancementsProvider.java
@@ -67,6 +67,7 @@ public class UAdvancementsProvider extends FabricAdvancementProvider {
             for (Race r : extra) {
                 builder.criterion("be_" + r.getId().getPath(), UCriteria.PLAYER_CHANGE_RACE.create(new RaceChangeCriterion.Conditions(Optional.empty(), r)));
             }
+            builder.criteriaMerger(AdvancementRequirements.CriterionMerger.OR);
         }
 
         return builder.build(consumer, race.getId().getPath() + "_route");
@@ -117,17 +118,17 @@ public class UAdvancementsProvider extends FabricAdvancementProvider {
             p.child(UItems.LIGHTNING_JAR).hidden().frame(AdvancementFrame.CHALLENGE).apply(d -> applyLightningBugCriterions(d, RacePredicate.of(Set.of(Race.CHANGELING), Set.of()), 10, 90)).build(consumer, "lightning_bug");
             p.child(UItems.LIGHTNING_JAR).hidden().frame(AdvancementFrame.CHALLENGE).apply(d -> applyLightningBugCriterions(d, RacePredicate.of(Set.of(), Set.of(Race.CHANGELING)), 10, 90)).build(consumer, "wonder_bolt");
         });
-        parent.child(UItems.PEGASUS_FEATHER).hidden().frame(AdvancementFrame.CHALLENGE).criterion("shed_feather", CustomEventCriterion.createFlying("shed_feather")).rewards(AdvancementRewards.Builder.experience(1)).build(consumer, "molting_season_1")
+        parent.child(UItems.PEGASUS_FEATHER).hidden().frame(AdvancementFrame.TASK).criterion("shed_feather", CustomEventCriterion.createFlying("shed_feather")).rewards(AdvancementRewards.Builder.experience(1)).build(consumer, "molting_season_1")
             .child(UItems.PEGASUS_FEATHER).apply(d -> applyShedFeatherCriterions(d, 2, 2)).build(consumer, "molting_season_2")
             .child(UItems.PEGASUS_FEATHER).apply(d -> applyShedFeatherCriterions(d, 4, 8)).build(consumer, "molting_season_3")
             .child(UItems.PEGASUS_FEATHER).apply(d -> applyShedFeatherCriterions(d, 8, 20)).build(consumer, "molting_season_4")
             .child(UItems.PEGASUS_FEATHER).apply(d -> applyShedFeatherCriterions(d, 16, 40)).build(consumer, "molting_season_5")
             .child(UItems.PEGASUS_FEATHER).apply(d -> applyShedFeatherCriterions(d, 32, 80)).build(consumer, "molting_season_6")
             .child(UItems.PEGASUS_FEATHER).apply(d -> applyShedFeatherCriterions(d, 64, 200)).build(consumer, "molting_season_7")
-            .child(UItems.PEGASUS_FEATHER).apply(d -> applyShedFeatherCriterions(d, 128, 500)).build(consumer, "molting_season_8")
-            .child(UItems.PEGASUS_FEATHER).apply(d -> applyShedFeatherCriterions(d, 256, 1000)).build(consumer, "molting_season_9")
-            .child(UItems.PEGASUS_FEATHER).apply(d -> applyShedFeatherCriterions(d, 512, 2280)).build(consumer, "molting_season_10")
-            .child(UItems.GOLDEN_FEATHER).apply(d -> applyShedFeatherCriterions(d, 1024, 4560)).build(consumer, "molting_season_11")
+            .child(UItems.PEGASUS_FEATHER).apply(d -> applyShedFeatherCriterions(d, 128, 500)).frame(AdvancementFrame.CHALLENGE).build(consumer, "molting_season_8")
+            .child(UItems.PEGASUS_FEATHER).apply(d -> applyShedFeatherCriterions(d, 256, 1000)).frame(AdvancementFrame.CHALLENGE).build(consumer, "molting_season_9")
+            .child(UItems.PEGASUS_FEATHER).apply(d -> applyShedFeatherCriterions(d, 512, 2280)).frame(AdvancementFrame.CHALLENGE).build(consumer, "molting_season_10")
+            .child(UItems.GOLDEN_FEATHER).apply(d -> applyShedFeatherCriterions(d, 1024, 4560)).frame(AdvancementFrame.CHALLENGE).build(consumer, "molting_season_11")
             .child(UItems.GOLDEN_FEATHER).apply(d -> applyShedFeatherCriterions(d, 2048, 10000)).frame(AdvancementFrame.GOAL).build(consumer, "dedicated_flier");
     }
 
diff --git a/src/main/java/com/minelittlepony/unicopia/server/world/gen/CloudCarver.java b/src/main/java/com/minelittlepony/unicopia/server/world/gen/CloudCarver.java
index 41736d0d..f92abb9a 100644
--- a/src/main/java/com/minelittlepony/unicopia/server/world/gen/CloudCarver.java
+++ b/src/main/java/com/minelittlepony/unicopia/server/world/gen/CloudCarver.java
@@ -167,7 +167,10 @@ public class CloudCarver extends CaveCarver {
             MutableBoolean replacedGrassy
         ) {
         if (super.carveAtPoint(context, config, chunk, posToBiome, mask, pos, tmp, aquiferSampler, replacedGrassy)) {
-            topWrittenPositions.remove(tmp.set(pos).move(Direction.DOWN).asLong());
+            tmp.set(pos).move(Direction.DOWN);
+            if (!topWrittenPositions.isEmpty()) {
+                topWrittenPositions.remove(tmp.asLong());
+            }
             topWrittenPositions.add(pos.asLong());
             if (chunk.getBlockState(tmp).isOf(UBlocks.SOGGY_CLOUD)) {
                 chunk.setBlockState(tmp, UBlocks.CLOUD.getDefaultState(), false);