When you create a new instance of a tilemap by using CTRL + left click, if you try to load a TMX it replaces the tiles on the tilemap instead that you cloned the instance from.
R265 Windows 10 Home
Cannot provide a CAPX or browser information for this because it's an editor bug.
steps to reproduce:
- Add a tilemap.
- Copy it by pressing CTRL and clicking on it with the left mouse button.
- Try to load a new TMX.