Something has gone horribly, horribly wrong.
I tried to follow your advice, Aro, and I widened and "peninsulated" the ice shores in the picture I had shown before. Nothing changed. I looked at few WW maps with growing ice, and noticed that the special water ice tiles are all the same in a specific "growing area". So, I replaced all other special tiles with ice02 special tile. Nothing new. I also noticed that the destroyed ice doesn't grow back, but units can cross it :O
Now, the crazy sh*t happened:
I made a closed pool of water for testing, 12x12 in size. I divided it into three strips, and filled each one with different ice tiles (for example, strip one with ice01 special tiles, and appropriately large, ready ice shores). I tested it in the game. Nothing! The ice did not grow! I then completely surrounded the area with ice shore, widened the shores, and tested again. The game f*cking crashed! I get internal errors everytime I try to run the map!
I uploaded a picture from the pool that made the map unplayable!