Fix Level leak in debug HUD (#9699)

Co-authored-by: malte0811 <malte0811@web.de>

src/main/java/net/minecraftforge/client/gui/overlay/ForgeGui.java

@@ -474,6 +474,13 @@ public class ForgeGui extends Gui
         }
     }
 
+    @Override
+    public void clearCache()
+    {
+        super.clearCache();
+        this.debugOverlay.clearChunkCache();
+    }
+
     protected void renderRecordOverlay(int width, int height, float partialTick, GuiGraphics guiGraphics)
     {
         if (overlayMessageTime > 0)