Every time a tilemap instance is added to the layout it inherits the tiles (I mean the tiles placed on the canvas, not the tilemap image) from the previous instance instead of the default instance, which in my case is blank. Because of this you have to either erase every tile from each new instance, or track down and copy/paste the default blank one.
Any chance this can be fixed for the next build?
On that note, shouldn't objects have a "make default instance" button for new instances to inherit their properties from? Using the very first instance ever placed is...troublesome.