build.gradle

@@ -13,7 +13,7 @@ apply plugin: 'net.minecraftforge.gradle'
 apply plugin: 'eclipse'
 apply plugin: 'maven-publish'
 
-version = '1.12.8'
+version = '1.12.7'
 group = 'de.ellpeck.prettypipes' // http://maven.apache.org/guides/mini/guide-naming-conventions.html
 archivesBaseName = 'PrettyPipes'
 

src/main/java/de/ellpeck/prettypipes/pipe/PipeBlockEntity.java

@@ -240,8 +240,8 @@ public class PipeBlockEntity extends BlockEntity implements MenuProvider, IPipeC
                     }
                     // totalSpace will be the amount of items that fit into the attached container
                     var totalSpace = 0;
-                    var copy = stack.copy();
                     for (var i = startSlot; i < slotAmount; i++) {
+                        var copy = stack.copy();
                         var maxStackSize = copy.getMaxStackSize();
                         // if the container can store more than 64 items in this slot, then it's likely
                         // a barrel or similar, meaning that the slot limit matters more than the max stack size