Merge remote-tracking branch 'origin/master-1.20-lts' into master-1.21-lts

Author: rubensworks

src/main/java/org/cyclops/integrateddynamics/core/item/ItemPart.java

@@ -83,7 +83,7 @@ public InteractionResult useOn(UseOnContext context) {
 
         ItemStack itemStack = player.getItemInHand(hand);
         IPartContainer partContainerFirst = PartHelpers.getPartContainer(world, pos, side).orElse(null);
-        if(partContainerFirst != null) {
+        if(partContainerFirst != null && !partContainerFirst.hasPart(side)) {
             // Add part to existing cable
             if(PartHelpers.addPart(world, pos, side, getPart(), itemStack)) {
                 if(world.isClientSide()) {