SOLVED, not a bug.
« Hi, since i installed Tiled 1.5, when i export tiled maps as lua files, there’s only 3 tileset properties left into the map’s lua table when i export. Tileset name, firstgid and filename are there but any other property is missing like image path, imagewidth… »
Fix: check embed tileset on new tileset creation or press the embed tileset button in tileset settings.
It will include tileset properties into the lua map file that it belongs to.