Playing Shimazu I paid good money and exchange a hostage for a trade agreement with the Ikko Ikki. Next turn I get the message "trade disrupted". (I'm not sure but I think their port is blockaded). Fair enough.
But I check the diplomatic screen and not only is the trade disrupted, but the trade agreement is gone as well. But it is, however, possible to make a new trade agreement with the Ikko Ikki. Only I have to pay again and my hostage is still in jail. What gives?
1. Why is a trade agreement that is only temporarily disrupted cancelled?
2. How can it be that trade is disrupted in a way to cancel the trade agreement, but I can make a new trade agreement the same turn?
3. Sometimes it's even worse: you get the message that trade is disrupted and the trade is gone, the trade agreement is gone and even your own trade route is temporarily unavailable (you can't use it for another trade partner). This surely is a bug?