Do not allow cross-planet launch pads

core/src/mindustry/world/Block.java

@@ -621,6 +621,7 @@ public class Block extends UnlockableContent implements Senseable{
 
     public boolean canReplace(Block other){
         if(other.alwaysReplace) return true;
+        if(other.privileged) return false;
         return other.replaceable && (other != this || (rotate && quickRotate)) && this.group != BlockGroup.none && other.group == this.group &&
             (size == other.size || (size >= other.size && ((subclass != null && subclass == other.subclass) || group.anyReplace)));
     }

core/src/mindustry/world/blocks/campaign/LaunchPad.java

@@ -168,7 +168,7 @@ public class LaunchPad extends Block{
 
             table.button(Icon.upOpen, Styles.cleari, () -> {
                 ui.planet.showSelect(state.rules.sector, other -> {
-                    if(state.isCampaign()){
+                    if(state.isCampaign() && other.planet == state.rules.sector.planet){
                         state.rules.sector.info.destination = other;
                     }
                 });