diff --git a/src/data/kotlin/ru/dbotthepony/mc/otm/datagen/MatterData.kt b/src/data/kotlin/ru/dbotthepony/mc/otm/datagen/MatterData.kt
index f3965fe59..6e65ea8c0 100644
--- a/src/data/kotlin/ru/dbotthepony/mc/otm/datagen/MatterData.kt
+++ b/src/data/kotlin/ru/dbotthepony/mc/otm/datagen/MatterData.kt
@@ -28,18 +28,6 @@ fun addMatterData(provider: MatterDataProvider) {
 			Items.OXIDIZED_CUT_COPPER,
 		) to Items.CUT_COPPER,
 
-		listOf(
-			Items.EXPOSED_CUT_COPPER_SLAB,
-			Items.WEATHERED_CUT_COPPER_SLAB,
-			Items.OXIDIZED_CUT_COPPER_SLAB,
-		) to Items.CUT_COPPER_SLAB,
-
-		listOf(
-			Items.EXPOSED_CUT_COPPER_STAIRS,
-			Items.WEATHERED_CUT_COPPER_STAIRS,
-			Items.OXIDIZED_CUT_COPPER_STAIRS,
-		) to Items.CUT_COPPER_STAIRS,
-
 		listOf(
 			Items.WAXED_EXPOSED_COPPER,
 			Items.WAXED_WEATHERED_COPPER,
@@ -51,18 +39,6 @@ fun addMatterData(provider: MatterDataProvider) {
 			Items.WAXED_WEATHERED_CUT_COPPER,
 			Items.WAXED_OXIDIZED_CUT_COPPER,
 		) to Items.WAXED_CUT_COPPER,
-
-		listOf(
-			Items.WAXED_EXPOSED_CUT_COPPER_SLAB,
-			Items.WAXED_WEATHERED_CUT_COPPER_SLAB,
-			Items.WAXED_OXIDIZED_CUT_COPPER_SLAB,
-		) to Items.WAXED_CUT_COPPER_SLAB,
-
-		listOf(
-			Items.WAXED_EXPOSED_CUT_COPPER_STAIRS,
-			Items.WAXED_WEATHERED_CUT_COPPER_STAIRS,
-			Items.WAXED_OXIDIZED_CUT_COPPER_STAIRS,
-		) to Items.WAXED_CUT_COPPER_STAIRS,
 	)
 
 	for ((children, parent) in copper) {
diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/matter/MatterManager.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/matter/MatterManager.kt
index 496a60c48..d53779ce7 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/matter/MatterManager.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/matter/MatterManager.kt
@@ -679,12 +679,6 @@ object MatterManager {
 				return Result(value2)
 			}
 
-			val value3 = Registry.indirect(item)
-
-			if (value3.value != null) {
-				return value3
-			}
-
 			if (item in seenItems) {
 				return Result.SKIPPED
 			}
@@ -692,6 +686,12 @@ object MatterManager {
 			seenItems.addLast(item)
 
 			try {
+				val value3 = Registry.indirect(item)
+
+				if (value3.value != null) {
+					return value3
+				}
+
 				val result = doDetermineValue(item)
 				cachedIterationResults[item] = result
 				return result