Oh, I see…I assumed it was was a part of the Tilemap system.
Apparently, Tilesheet was removed in OpenFL 4 according to this post: Type not found : openfl.display.Tilesheet
It looks like it’s still referenced in the Haxeflixel code if FLX_DRAW_QUADS isn’t set. Take a look at the source code for FlxBaseItem here and you can see where it’s checking for it near the top:
So maybe set it in your project.xml file?
