diff --git a/src/item/StringToItemParser.php b/src/item/StringToItemParser.php
index ee0f1f5c520..a1660093972 100644
--- a/src/item/StringToItemParser.php
+++ b/src/item/StringToItemParser.php
@@ -298,6 +298,7 @@ private static function registerBlocks(self $result) : void{
 		$result->registerBlock("crimson_fence", fn() => Blocks::CRIMSON_FENCE());
 		$result->registerBlock("crimson_fence_gate", fn() => Blocks::CRIMSON_FENCE_GATE());
 		$result->registerBlock("crimson_hyphae", fn() => Blocks::CRIMSON_HYPHAE()->setStripped(false));
+		$result->registerBlock("crimson_nylium", fn() => Blocks::CRIMSON_NYLIUM());
 		$result->registerBlock("crimson_planks", fn() => Blocks::CRIMSON_PLANKS());
 		$result->registerBlock("crimson_pressure_plate", fn() => Blocks::CRIMSON_PRESSURE_PLATE());
 		$result->registerBlock("crimson_roots", fn() => Blocks::CRIMSON_ROOTS());
@@ -1136,6 +1137,7 @@ private static function registerBlocks(self $result) : void{
 		$result->registerBlock("warped_fence", fn() => Blocks::WARPED_FENCE());
 		$result->registerBlock("warped_fence_gate", fn() => Blocks::WARPED_FENCE_GATE());
 		$result->registerBlock("warped_hyphae", fn() => Blocks::WARPED_HYPHAE()->setStripped(false));
+		$result->registerBlock("warped_nylium", fn() => Blocks::WARPED_NYLIUM());
 		$result->registerBlock("warped_planks", fn() => Blocks::WARPED_PLANKS());
 		$result->registerBlock("warped_pressure_plate", fn() => Blocks::WARPED_PRESSURE_PLATE());
 		$result->registerBlock("warped_roots", fn() => Blocks::WARPED_ROOTS());
diff --git a/tests/phpunit/block/block_factory_consistency_check.json b/tests/phpunit/block/block_factory_consistency_check.json
index 79804d8cbd8..e4a9044f03e 100644
--- a/tests/phpunit/block/block_factory_consistency_check.json
+++ b/tests/phpunit/block/block_factory_consistency_check.json
@@ -154,6 +154,7 @@
     "CRIMSON_FENCE": 1,
     "CRIMSON_FENCE_GATE": 16,
     "CRIMSON_HYPHAE": 6,
+    "CRIMSON_NYLIUM": 1,
     "CRIMSON_PLANKS": 1,
     "CRIMSON_PRESSURE_PLATE": 2,
     "CRIMSON_ROOTS": 1,
@@ -690,6 +691,7 @@
     "WARPED_FENCE": 1,
     "WARPED_FENCE_GATE": 16,
     "WARPED_HYPHAE": 6,
+    "WARPED_NYLIUM": 1,
     "WARPED_PLANKS": 1,
     "WARPED_PRESSURE_PLATE": 2,
     "WARPED_ROOTS": 1,