--- a/net/minecraft/world/level/block/entity/BlockEntityType.java
+++ b/net/minecraft/world/level/block/entity/BlockEntityType.java
@@ -234,7 +_,7 @@
     );
     private static final Set<BlockEntityType<?>> OP_ONLY_CUSTOM_DATA = Set.of(COMMAND_BLOCK, LECTERN, SIGN, HANGING_SIGN, MOB_SPAWNER, TRIAL_SPAWNER);
     private final BlockEntityType.BlockEntitySupplier<? extends T> factory;
-    private final Set<Block> validBlocks;
+    public final Set<Block> validBlocks;
     private final Holder.Reference<BlockEntityType<?>> builtInRegistryHolder = BuiltInRegistries.BLOCK_ENTITY_TYPE.createIntrusiveHolder(this);
 
     @Nullable
