fix Jigsaw block kicking user

paper-server/patches/sources/net/minecraft/world/level/block/entity/JigsawBlockEntity.java.patch

@@ -0,0 +1,16 @@
+--- a/net/minecraft/world/level/block/entity/JigsawBlockEntity.java
++++ b/net/minecraft/world/level/block/entity/JigsawBlockEntity.java
+@@ -131,7 +131,12 @@
+     public void generate(ServerLevel world, int maxDepth, boolean keepJigsaws) {
+         BlockPos blockPos = this.getBlockPos().relative(this.getBlockState().getValue(JigsawBlock.ORIENTATION).front());
+         Registry<StructureTemplatePool> registry = world.registryAccess().lookupOrThrow(Registries.TEMPLATE_POOL);
+-        Holder<StructureTemplatePool> holder = registry.getOrThrow(this.pool);
++        // Paper start - Replace getHolderOrThrow with a null check
++        Holder<StructureTemplatePool> holder = registry.get(this.pool).orElse(null);
++        if (holder == null) {
++            return;
++        }
++        // Paper end - Replace getHolderOrThrow with a null check
+         JigsawPlacement.generateJigsaw(world, holder, this.target, maxDepth, blockPos, keepJigsaws);
+     }
+