Thanks for explanation!
Well, I have good news and bad news. Good news: caves working perfectly. Bad news: underground sewers acts strange. I can enter them, move freely, exit, everything is OK. When I exit, map looks little trimmed, but it is still fine and I explore it completely. When I step on exit grid, I am back on the world map. Problem is, I am not back where I was, but somewhere distant: for example, I travel from Arroyo to Klamath, have random encounter, enter sewers, exit and go to grid. Back to world map, I am somewhere around Redding or San Francisco, or... who knows where, but not between Arroyo and Klamath. Interestingly this is not happening with cave maps.
Well, I have good news and bad news. Good news: caves working perfectly. Bad news: underground sewers acts strange. I can enter them, move freely, exit, everything is OK. When I exit, map looks little trimmed, but it is still fine and I explore it completely. When I step on exit grid, I am back on the world map. Problem is, I am not back where I was, but somewhere distant: for example, I travel from Arroyo to Klamath, have random encounter, enter sewers, exit and go to grid. Back to world map, I am somewhere around Redding or San Francisco, or... who knows where, but not between Arroyo and Klamath. Interestingly this is not happening with cave maps.