the way functions work has definitively changed from r110 to r111. There's a recursive flood fill algorithm in my project picking labyrinth tiles, which connect to each other. So after updating to r111 it stopped working correctly.
But I was able to fix it by adding "Wait 0 seconds" before each recursive function call with tile UID as a parameter. I assume it has something to do with top level event and picking, but I don't understand the mechanism.