Fixed #2287

core/src/mindustry/entities/comp/BuilderComp.java

@@ -200,6 +200,10 @@ abstract class BuilderComp implements Unitc{
         }
     }
 
+    boolean activelyBuilding(){
+        return isBuilding() && updateBuilding;
+    }
+
     /** Return the build request currently active, or the one at the top of the queue.*/
     @Nullable
     BuildPlan buildPlan(){

core/src/mindustry/entities/comp/MinerComp.java

@@ -51,7 +51,7 @@ abstract class MinerComp implements Itemsc, Posc, Teamc, Rotc, Drawc, Unitc{
         }
 
         if(mineTile == null || core == null || mineTile.block() != Blocks.air || dst(mineTile.worldx(), mineTile.worldy()) > miningRange
-        || (((Object)this) instanceof Builderc && ((Builderc)(Object)this).isBuilding())
+        || (((Object)this) instanceof Builderc && ((Builderc)(Object)this).activelyBuilding())
         || mineTile.drop() == null || !acceptsItem(mineTile.drop()) || !canMine(mineTile.drop())){
             mineTile = null;
             mineTimer = 0f;