There are 2 tiles which have "tile-properties", tile id="0" , and tile id="1".
And, there are 2 layers named "terrain" , and "upper".
There is no tile id="1" in these 2 layers. Some are tile id="0". tile id="0" is a special tile which means "no tile here" (the start index of tile id is 1), I'm not sure why it has "tile-properties".
In this plugin, it will skip tile with tile id="0". So there is no tile which has "tile-properties" in these 2 layers. No message shown at log.