diff --git a/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/BukkitCompatibilityManager.java b/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/BukkitCompatibilityManager.java
index 4d8bab126..0d6f63e8e 100644
--- a/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/BukkitCompatibilityManager.java
+++ b/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/BukkitCompatibilityManager.java
@@ -110,7 +110,7 @@ public class BukkitCompatibilityManager implements CompatibilityManager {
             this.registerLevelerProvider("AureliumSkills", new AureliumSkillsLevelerProvider());
         }
         if (this.isPluginEnabled("McMMO")) {
-            this.registerLevelerProvider("McMMO", new McMMOLevelerProvider());
+            this.registerLevelerProvider("mcMMO", new McMMOLevelerProvider());
             logHook("McMMO");
         }
         if (this.isPluginEnabled("MMOCore")) {
diff --git a/common-files/src/main/resources/mappings.yml b/common-files/src/main/resources/mappings.yml
index a01cdc4e7..4f48d9546 100644
--- a/common-files/src/main/resources/mappings.yml
+++ b/common-files/src/main/resources/mappings.yml
@@ -3016,7 +3016,6 @@ $$>=1.20.3#trapdoor:
   minecraft:waxed_oxidized_copper_trapdoor[facing=east,half=bottom,open=false,powered=true,waterlogged=true]: minecraft:waxed_oxidized_copper_trapdoor[facing=east,half=bottom,open=false,powered=false,waterlogged=true]
   minecraft:waxed_oxidized_copper_trapdoor[facing=west,half=bottom,open=false,powered=true,waterlogged=true]: minecraft:waxed_oxidized_copper_trapdoor[facing=west,half=bottom,open=false,powered=false,waterlogged=true]
 
-# 1.21.4+
 $$>=1.21.4#trapdoor:
   minecraft:pale_oak_trapdoor[facing=north,half=top,open=true,powered=true,waterlogged=false]: minecraft:pale_oak_trapdoor[facing=north,half=top,open=true,powered=false,waterlogged=false]
   minecraft:pale_oak_trapdoor[facing=south,half=top,open=true,powered=true,waterlogged=false]: minecraft:pale_oak_trapdoor[facing=south,half=top,open=true,powered=false,waterlogged=false]
@@ -3438,7 +3437,6 @@ minecraft:iron_door[facing=west,half=lower,hinge=right,open=true,powered=true]:
 minecraft:iron_door[facing=west,half=upper,hinge=left,open=true,powered=true]: minecraft:iron_door[facing=west,half=upper,hinge=left,open=true,powered=false]
 minecraft:iron_door[facing=west,half=upper,hinge=right,open=true,powered=true]: minecraft:iron_door[facing=west,half=upper,hinge=right,open=true,powered=false]
 
-# 1.20.3+
 $$>=1.20.3#door:
   minecraft:copper_door[facing=east,half=lower,hinge=left,open=false,powered=true]: minecraft:copper_door[facing=east,half=lower,hinge=left,open=false,powered=false]
   minecraft:copper_door[facing=east,half=lower,hinge=right,open=false,powered=true]: minecraft:copper_door[facing=east,half=lower,hinge=right,open=false,powered=false]
@@ -3697,7 +3695,6 @@ $$>=1.20.3#door:
   minecraft:waxed_oxidized_copper_door[facing=west,half=upper,hinge=left,open=true,powered=true]: minecraft:waxed_oxidized_copper_door[facing=west,half=upper,hinge=left,open=true,powered=false]
   minecraft:waxed_oxidized_copper_door[facing=west,half=upper,hinge=right,open=true,powered=true]: minecraft:waxed_oxidized_copper_door[facing=west,half=upper,hinge=right,open=true,powered=false]
 
-# 1.21.4+
 $$>=1.21.4#door:
   minecraft:pale_oak_door[facing=east,half=lower,hinge=left,open=false,powered=true]: minecraft:pale_oak_door[facing=east,half=lower,hinge=left,open=false,powered=false]
   minecraft:pale_oak_door[facing=east,half=lower,hinge=right,open=false,powered=true]: minecraft:pale_oak_door[facing=east,half=lower,hinge=right,open=false,powered=false]
@@ -3928,6 +3925,30 @@ $$>=1.21.4#fence_gate:
   minecraft:pale_oak_fence_gate[facing=north,in_wall=true,open=false,powered=true]: minecraft:pale_oak_fence_gate[facing=north,in_wall=true,open=false,powered=false]
   minecraft:pale_oak_fence_gate[facing=north,in_wall=true,open=true,powered=true]: minecraft:pale_oak_fence_gate[facing=north,in_wall=true,open=true,powered=false]
 
+#### Slab ####
+minecraft:petrified_oak_slab[type=bottom,waterlogged=false]: minecraft:oak_slab[type=bottom,waterlogged=false]
+minecraft:petrified_oak_slab[type=top,waterlogged=false]: minecraft:oak_slab[type=top,waterlogged=false]
+minecraft:petrified_oak_slab[type=bottom,waterlogged=true]: minecraft:oak_slab[type=bottom,waterlogged=true]
+minecraft:petrified_oak_slab[type=top,waterlogged=true]: minecraft:oak_slab[type=top,waterlogged=true]
+
+$$>=1.20.3#slab:
+  minecraft:waxed_cut_copper_slab[type=bottom,waterlogged=false]: minecraft:cut_copper_slab[type=bottom,waterlogged=false]
+  minecraft:waxed_cut_copper_slab[type=top,waterlogged=false]: minecraft:cut_copper_slab[type=top,waterlogged=false]
+  minecraft:waxed_cut_copper_slab[type=bottom,waterlogged=true]: minecraft:cut_copper_slab[type=bottom,waterlogged=true]
+  minecraft:waxed_cut_copper_slab[type=top,waterlogged=true]: minecraft:cut_copper_slab[type=top,waterlogged=true]
+  minecraft:waxed_exposed_cut_copper_slab[type=bottom,waterlogged=false]: minecraft:exposed_cut_copper_slab[type=bottom,waterlogged=false]
+  minecraft:waxed_exposed_cut_copper_slab[type=top,waterlogged=false]: minecraft:exposed_cut_copper_slab[type=top,waterlogged=false]
+  minecraft:waxed_exposed_cut_copper_slab[type=bottom,waterlogged=true]: minecraft:exposed_cut_copper_slab[type=bottom,waterlogged=true]
+  minecraft:waxed_exposed_cut_copper_slab[type=top,waterlogged=true]: minecraft:exposed_cut_copper_slab[type=top,waterlogged=true]
+  minecraft:waxed_weathered_cut_copper_slab[type=bottom,waterlogged=false]: minecraft:weathered_cut_copper_slab[type=bottom,waterlogged=false]
+  minecraft:waxed_weathered_cut_copper_slab[type=top,waterlogged=false]: minecraft:weathered_cut_copper_slab[type=top,waterlogged=false]
+  minecraft:waxed_weathered_cut_copper_slab[type=bottom,waterlogged=true]: minecraft:weathered_cut_copper_slab[type=bottom,waterlogged=true]
+  minecraft:waxed_weathered_cut_copper_slab[type=top,waterlogged=true]: minecraft:weathered_cut_copper_slab[type=top,waterlogged=true]
+  minecraft:waxed_oxidized_cut_copper_slab[type=bottom,waterlogged=false]: minecraft:oxidized_cut_copper_slab[type=bottom,waterlogged=false]
+  minecraft:waxed_oxidized_cut_copper_slab[type=top,waterlogged=false]: minecraft:oxidized_cut_copper_slab[type=top,waterlogged=false]
+  minecraft:waxed_oxidized_cut_copper_slab[type=bottom,waterlogged=true]: minecraft:oxidized_cut_copper_slab[type=bottom,waterlogged=true]
+  minecraft:waxed_oxidized_cut_copper_slab[type=top,waterlogged=true]: minecraft:oxidized_cut_copper_slab[type=top,waterlogged=true]
+
 #### Chorus Plant ####
 # Chorus Plant does support transparent textures, but man... its hitbox is super weird. You're probably better off using leaves.
 # minecraft:chorus_plant[down=false,east=false,north=false,south=false,up=false,west=false]: minecraft:chorus_plant[down=true,east=true,north=true,south=true,up=true,west=true]