Fixed #5703

core/src/mindustry/world/Block.java

@@ -887,7 +887,7 @@ public class Block extends UnlockableContent{
         }
 
         //generate paletted team regions
-        if(teamRegion.found()){
+        if(teamRegion != null && teamRegion.found()){
             for(Team team : Team.all){
                 //if there's an override, don't generate anything
                 if(team.hasPalette && !Core.atlas.has(name + "-team-" + team.name)){

core/src/mindustry/world/blocks/storage/CoreBlock.java

@@ -302,7 +302,13 @@ public class CoreBlock extends StorageBlock{
         @Override
         public void afterDestroyed(){
             if(state.rules.coreCapture){
-                tile.setNet(block, lastDamage, 0);
+                if(!net.client()){
+                    tile.setBlock(block, lastDamage);
+                }
+
+                //delay so clients don't destroy it afterwards
+                Core.app.post(() -> tile.setNet(block, lastDamage, 0));
+
                 //building does not exist on client yet
                 if(!net.client()){
                     //core is invincible for several seconds to prevent recapture