Structure voids aren't part of the "#minecraft:dragon_immune" or "#minecraft:wither_immune" tags

Hi there!

This looks like a relative of MC-102908.

Also I can confirm for release 1.16.2.

Still other structure related blocks are in the tags

Relates to MC-165218

Can confirm in 21w03a.

Can confirm in 21w05b.

Can confirm in 21w06a.

Can confirm in 21w07a.

Can confirm in 21w11a.

Can confirm in 21w13a.

Can confirm in 21w15a.

Can confirm in 1.17.1.

I can confirm this behavior in 1.18 Release Candidate 3.

Here's a potential fix regarding this issue. The following is based on a decompiled version of Minecraft 1.17.1 using MCP-Reborn.

Potential Fix:

In the net.minecraft.data.tags.BlockTagsProvider.java class, simply adding Blocks.STRUCTURE_VOID within the DRAGON_IMMUNE and WITHER_IMMUNE block tags should resolve this problem. The correct lines of code within this particular class should look something like the following:

net.minecraft.data.tags.BlockTagsProvider.java

public class BlockTagsProvider extends TagsProvider<Block> {
   public BlockTagsProvider(DataGenerator p_126511_) { super(p_126511_, Registry.BLOCK); }

   protected void addTags() {
      ...
      this.tag(BlockTags.DRAGON_IMMUNE).add(Blocks.BARRIER, Blocks.BEDROCK, Blocks.END_PORTAL, Blocks.END_PORTAL_FRAME, Blocks.END_GATEWAY, Blocks.COMMAND_BLOCK, Blocks.REPEATING_COMMAND_BLOCK, Blocks.CHAIN_COMMAND_BLOCK, Blocks.STRUCTURE_BLOCK, Blocks.JIGSAW, Blocks.MOVING_PISTON, Blocks.OBSIDIAN, Blocks.CRYING_OBSIDIAN, Blocks.END_STONE, Blocks.IRON_BARS, Blocks.RESPAWN_ANCHOR, Blocks.STRUCTURE_VOID);
      this.tag(BlockTags.WITHER_IMMUNE).add(Blocks.BARRIER, Blocks.BEDROCK, Blocks.END_PORTAL, Blocks.END_PORTAL_FRAME, Blocks.END_GATEWAY, Blocks.COMMAND_BLOCK, Blocks.REPEATING_COMMAND_BLOCK, Blocks.CHAIN_COMMAND_BLOCK, Blocks.STRUCTURE_BLOCK, Blocks.JIGSAW, Blocks.MOVING_PISTON, Blocks.STRUCTURE_VOID);
      ...

Can confirm in 1.18.

Can confirm in 1.18.1.

Can confirm in 1.18.2.

Can confirm in 1.19.

Can confirm in 1.19.2.