In the lower left corner tile tells you about the currently hovered tile in this format:
x, y [index-in-tileset]
What it doesn’t tell you is the tileset used.
I accidentally added a copy of my tileset from another folder into my map and that (of course) broke auto-mapping. But it took me way too long to figure out what went wrong, because there is no way to tell that a tile belongs to another tileset without looking into the tmx file.
So my suggestion would be, to show:
x, y [index-in-tileset] (guid-of-tile)
Showing the tileset name would not help (at least not in my case, because the second tileset had the same name as the first one).