I went to the castle and killed the seed. After doing this he basically fell through the floor of the castle to a lower floor that doesn't exist. Now the body is stuck in the "basement" level of the castle spire that doesn't exist so I can't confirm the kill. I have left the game and come back in, reloaded my last save point, and nothing. Everytime I come back to the castle that yellow marker is under the floor and I can't get to it. Everyone else in the castle will respawn but the seed does not and the marker doesn't move to a reachable area. So after being stuck for weeks with not being able to get the characters to the coronation I'm stuck AGAIN! Becoming hard to enjoy this game.
If you walk in the front gate and turn to the left you will see some seed bags against the wall by a barrel. The yellow marker (ironically for the seed) is even with the seed bags. I need to be able to walk through that wall where those seed bags are.