Not sure if Layer2 should even exist or not.
I only read that ID0 tile changes trigger for skirmishes.
And in vanilla game, all of the tile changes occur (broken bridges, shops, houses and villages)
so I made Layer2( ID0 ) to have these changes.
First, I tried it with spaces which as you said didn't work.
Then I made the whole map again in Layer2 (from 0,0 to 25,15) including the tile changes
as a whole rectangular and even configured the new properties.
It didn't work.
Then I removed Layer2 (ID0) and kept all of the above layers
with their deafult IDs (1 to 6) and then with new IDs (0 to 5)
Keeps saying a tile is unassigned or that the index is surpassed
even though I've checked the properties over and over.
I've inserted other maps with/ without tile changes successfully with working events
but this village+skirmish map is just annoying.