diff --git a/worldedit-bukkit/adapters/adapter-1_20_4/build.gradle.kts b/worldedit-bukkit/adapters/adapter-1_20_4/build.gradle.kts
index 02f5a3c53a..f18ef582fd 100644
--- a/worldedit-bukkit/adapters/adapter-1_20_4/build.gradle.kts
+++ b/worldedit-bukkit/adapters/adapter-1_20_4/build.gradle.kts
@@ -12,6 +12,6 @@ repositories {
 
 dependencies {
     // url=https://repo.papermc.io/service/rest/repository/browse/maven-public/io/papermc/paper/dev-bundle/1.20.4-R0.1-SNAPSHOT
-    the<PaperweightUserDependenciesExtension>().paperDevBundle("1.20.4-R0.1-20240106.182028-62")
+    the<PaperweightUserDependenciesExtension>().paperDevBundle("1.20.4-R0.1-20240316.193646-135")
     compileOnly(libs.paperlib)
 }
diff --git a/worldedit-bukkit/adapters/adapter-1_20_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R3/PaperweightBlockMaterial.java b/worldedit-bukkit/adapters/adapter-1_20_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R3/PaperweightBlockMaterial.java
index edbe268fea..74b1c035cd 100644
--- a/worldedit-bukkit/adapters/adapter-1_20_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R3/PaperweightBlockMaterial.java
+++ b/worldedit-bukkit/adapters/adapter-1_20_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R3/PaperweightBlockMaterial.java
@@ -2,18 +2,15 @@
 
 import com.google.common.base.Suppliers;
 import com.sk89q.jnbt.CompoundTag;
-import com.sk89q.util.ReflectionUtil;
-import com.sk89q.worldedit.bukkit.adapter.Refraction;
 import com.sk89q.worldedit.bukkit.adapter.impl.fawe.v1_20_R3.nbt.PaperweightLazyCompoundTag;
 import com.sk89q.worldedit.world.registry.BlockMaterial;
 import net.minecraft.core.BlockPos;
 import net.minecraft.world.level.EmptyBlockGetter;
 import net.minecraft.world.level.block.Block;
 import net.minecraft.world.level.block.EntityBlock;
-import net.minecraft.world.level.block.LiquidBlock;
 import net.minecraft.world.level.block.entity.BlockEntity;
-import net.minecraft.world.level.block.state.BlockBehaviour;
 import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.material.Fluids;
 import net.minecraft.world.level.material.PushReaction;
 import org.bukkit.craftbukkit.v1_20_R3.block.data.CraftBlockData;
 
@@ -21,7 +18,6 @@ public class PaperweightBlockMaterial implements BlockMaterial {
 
     private final Block block;
     private final BlockState blockState;
-    private final boolean isTranslucent;
     private final CraftBlockData craftBlockData;
     private final org.bukkit.Material craftMaterial;
     private final int opacity;
@@ -36,11 +32,6 @@ public PaperweightBlockMaterial(Block block, BlockState blockState) {
         this.blockState = blockState;
         this.craftBlockData = CraftBlockData.fromData(blockState);
         this.craftMaterial = craftBlockData.getMaterial();
-        BlockBehaviour.Properties blockInfo = ReflectionUtil.getField(BlockBehaviour.class, block,
-                Refraction.pickName("properties", "aP"));
-        this.isTranslucent = !(boolean) ReflectionUtil.getField(BlockBehaviour.Properties.class, blockInfo,
-                Refraction.pickName("canOcclude", "n")
-        );
         opacity = blockState.getLightBlock(EmptyBlockGetter.INSTANCE, BlockPos.ZERO);
         BlockEntity tileEntity = !(block instanceof EntityBlock) ? null : ((EntityBlock) block).newBlockEntity(
                 BlockPos.ZERO,
@@ -75,7 +66,7 @@ public boolean isFullCube() {
 
     @Override
     public boolean isOpaque() {
-        return blockState.isOpaque();
+        return blockState.canOcclude();
     }
 
     @Override
@@ -85,14 +76,13 @@ public boolean isPowerSource() {
 
     @Override
     public boolean isLiquid() {
-        // TODO: Better check ?
-        return block instanceof LiquidBlock;
+        return !blockState.getFluidState().is(Fluids.EMPTY);
     }
 
     @Override
     public boolean isSolid() {
-        // TODO: Replace
-        return blockState.isSolid();
+        // No access to world -> EmptyBlockGetter
+        return blockState.isSolidRender(EmptyBlockGetter.INSTANCE, BlockPos.ZERO);
     }
 
     @Override
@@ -158,7 +148,7 @@ public boolean isReplacedDuringPlacement() {
 
     @Override
     public boolean isTranslucent() {
-        return isTranslucent;
+        return !blockState.canOcclude();
     }
 
     @Override