Fixed #2740

core/src/mindustry/game/DefaultWaves.java

@@ -206,5 +206,10 @@ public class DefaultWaves{
         //{mono, poly, mega, quad, oct}, //do not attack
         {flare, horizon, zenith, antumbra, eclipse}
         };
+
+        //required progression:
+        //- main progression of units, up to wave ~20
+        //- changes from
+        //- extra periodic patterns
     }
 }

core/src/mindustry/world/blocks/power/BurnerGenerator.java

@@ -39,6 +39,13 @@ public class BurnerGenerator extends ItemLiquidGenerator{
                 Draw.rect(turbineRegions[1], x, y, -totalTime * turbineSpeed);
 
                 Draw.rect(capRegion, x, y);
+
+                if(hasLiquids){
+                    Draw.color(liquids.current().color);
+                    Draw.alpha(liquids.currentAmount() / liquidCapacity);
+                    Draw.rect(liquidRegion, x, y);
+                    Draw.color();
+                }
             }
         }
     }