...

core/src/mindustry/entities/TargetPriority.java

@@ -3,5 +3,6 @@ package mindustry.entities;
 /** A higher ordinal means a higher priority. Higher priority blocks will always get targeted over those of lower priority, regardless of distance. */
 public enum TargetPriority{
     base,
-    turret
+    turret,
+    core
 }

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

@@ -29,6 +29,7 @@ public class CoreBlock extends StorageBlock{
         solid = true;
         update = true;
         hasItems = true;
+        priority = TargetPriority.core;
         flags = EnumSet.of(BlockFlag.core, BlockFlag.producer, BlockFlag.unitModifier);
         unitCapModifier = 10;
         activeSound = Sounds.respawning;

gradle.properties

@@ -1,3 +1,3 @@
 org.gradle.daemon=true
 org.gradle.jvmargs=-Xms256m -Xmx1024m
-archash=81c1af45d826a9a9553457b5c844b8b7d4faea7c
+archash=84c3889593afe0fc98a5f9f9efde501899338d76