when I make plans or edit maps with transparent tiles I get a LOT of artifacts. I attached a GIF screenshot in case anyone sees it and knows what the issue is.
It's normal for tiles to leave trails if you don't have an opaque background. The map editor has a "Designer Background" layer to help avoid this behavior at design time. But in order to make sure that your game performs optimally at run-time (no unnecessary drawing or erasing), the designer background is excluded when your game is compiled. You are expected to put an opaque background or something that will draw over the previous graphics in your map unless you
want the effect of leaving trails.
In your screenshot it looks like you *are* in the map editor, though, so it's strange you'd be getting trails. Did you delete the designer background or something? I suppose it's possible you found some circumstances in which the Designer Background wasn't created for you. Maybe you based your project off an old template from before Designer Background layers were introduced? If you want to add your own Designer Background layer that goes away at runtime, you can add a layer whose Tileset is not set to anything. Otherwise, I suggest adding a regular background layer that fills your display area. It can be a very simple 1x1 "Tile Size" and whatever "Virtual Size" you want for the layer big enough to fill the map. That way, whenever you put 1 tile on the layer it will automatically fill the whole layer and only consume 1 byte of memory.
